JavaScript Run-Time Library Reference

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Methods

Objects

Operators

Properties

Statements

Welcome to the JavaScript Language Reference

These handy blocks of information will help you explore the many different parts of JScript.
You'll find all the parts of the JavaScript language listed alphabetically under the Alphabetic Keyword List. But if you want to examine just one category, say, objects, each language category has its own, more compact section.
How's it work? Click on one of the headings to the left to display a list of items contained in that category. From this list, select the topic that you want to view. Once you've opened that topic, you can easily link to other related sections.
So, go ahead and take a look! Study some statements, mull over the methods, or figure out a few functions. You'll see just how versatile the JavaScript language can be!

Features	Description
Version Information	List of JavaScript versions by host application and list of features by version.
JavaScript Features (ECMA)	List of ECMA features currently in JScript.
JavaScript Features (Non-ECMA)	List of non-ECMA features currently in JScript.
Microsoft Scripting Run-time Features	List of scripting run-time features currently in JScript.

Language Element	Description
$1...$9 Properties	Returns the nine most-recently memorized portions found during pattern matching.
abs Method	Returns the absolute value of a number.
acos Method	Returns the arccosine of a number.
ActiveXObject Object	Enables and returns a reference to an Automation object.
Addition Operator (+)	Sums two numbers or concatenates two strings.
anchor Method	Places an HTML anchor with a NAME attribute around specified text in the object.
arguments Property	Returns an array containing each argument passed to the currently executing function.
Array Object	Provides support for creation of arrays of any data type.
asin Method	Returns the arcsine of a number.
Assignment Operator (=)	Assigns a value to a variable.
atan Method	Returns the arctangent of a number.
atan2 Method	Returns the angle (in radians) from the X axis to a point (y,x).
atEnd Method	Returns a Boolean value indicating if the enumerator is at the end of the collection.
big Method	Places HTML <BIG> tags around text in a String object.
Bitwise AND Operator (&)	Performs a bitwise AND on two expressions.
Bitwise Left Shift Operator (<<)	Shifts the bits of an expression to the left.
Bitwise NOT Operator (~)	Performs a bitwise NOT (negation) on an expression.
Bitwise OR Operator (\|)	Performs a bitwise OR on two expressions.
Bitwise Right Shift Operator (>>)	Shifts the bits of an expression to the right, maintaining sign.
Bitwise XOR Operator (^)	Performs a bitwise exclusive OR on two expressions.
blink Method	Places HTML <BLINK> tags around text in a String object.
bold Method	Places HTML <B> tags around text in a String object.
Boolean Object	Creates a new Boolean value.
break Statement	Terminates the current loop, or if in conjunction with a label, terminates the associated statement.
caller Property	Returns a reference to the function that invoked the current function.
catch Statement	Contains statements to execute when an error occurs in code within the try block.
@cc_on Statement	Activates conditional compilation support.
ceil Method	Returns the smallest integer greater than or equal to its numeric argument.
charAt Method	Returns the character at the specified index.
charCodeAt Method	Returns the Unicode encoding of the specified character.
Comma Operator (,)	Causes two expressions to be executed sequentially.
// (Single-line Comment Statement)	Causes single-line comments to be ignored by the JavaScript parser.
/../ (Multiline Comment Statement)	Causes multiline comments to be ignored by the JavaScript parser.
Comparison Operators	Returns a Boolean value indicating the result of the comparison.
compile Method	Compiles a regular expression into an internal format.
Compound Assignment Operators	List of compound assignment operators.
concat Method (Array)	Returns a new array consisting of a combination of two arrays.
concat Method (String)	Returns a String object containing the concatenation of two supplied strings.
Conditional Compilation	Allows the use of new JavaScript language features without sacrificing compatibility with browsers that don't support the features.
Conditional Compilation Variables	List of predefined variables used with conditional compilation.
Conditional (trinary) Operator (?:)	Executes one of two expressions depending on a condition.
constructor Property	Specifies the function that creates an object.
continue Statement	Stops the current iteration of a loop, and starts a new iteration.
cos Method	Returns the cosine of a number.
Data Type Conversion	Description of automatic data type conversion in JScript.
Date Object	Enables basic storage and retrieval of dates and times.
Decrement Operator (--)	Decrements a variable by one.
delete Operator	Deletes a property from an object, or removes an element from an array.
description Property	Returns or sets the descriptive string associated with a specific error.
Dictionary Object	Object that stores data key, item pairs.
dimensions Method	Returns the number of dimensions in a VBArray.
Division Operator (/)	Divides two numbers and returns a numeric result.
do...while Statement	Executes a statement block once, and then repeats execution of the loop until a condition expression evaluates to false.
E Property	Returns Euler's constant, the base of natural logarithms.
Enumerator Object	Enables enumeration of items in a collection.
Equality Operator (==)	Compares two expressions to determine if they are equal.
Error Object	An object that contains information about errors that occur while JavaScript code is running.
escape Method	Encodes String objects so they can be read on all computers.
eval Method	Evaluates JavaScript code and executes it.
exec Method	Executes a search for a match in a specified string.
exp Method	Returns e (the base of natural logarithms) raised to a power.
FileSystemObject Object	Provides access to a computer's file system.
fixed Method	Places HTML <TT> tags around text in a String object.
floor Method	Returns the greatest integer less than or equal to its numeric argument.
fontcolor Method	Places an HTML <FONT> tag with the COLOR attribute around the text in a String object.
fontsize Method	Places an HTML <FONT> tag with the SIZE attribute around the text in a String object.
for Statement	Executes a block of statements for as long as a specified condition is true.
for...in Statement	Executes one or more statements for each element of an object or array.
fromCharCode Method	Returns a string from a number of Unicode character values.
Function Object	Creates a new function.
function Statement	Declares a new function.
getDate Method	Returns the day of the month value in a Date object using local time.
getDay Method	Returns the day of the week value in a Date object using local time.
getFullYear Method	Returns the year value in the Date object using local time.
getHours Method	Returns the hours value in a Date object using local time.
getItem Method	Returns the item at the specified location.
getMilliseconds Method	Returns the milliseconds value in a Date object using local time.
getMinutes Method	Returns the minutes value stored in a Date object using local time.
getMonth Method	Returns the month value in the Date object using local time.
GetObject Function	Returns a reference to an Automation object from a file.
getSeconds Method	Returns seconds value stored in a Date object using local time.
getTime Method	Returns the time value in a Date object.
getTimezoneOffset Method	Returns the difference in minutes between the time on the host computer and Universal Coordinated Time (UTC).
getUTCDate Method	Returns the date value in a Date object using Universal Coordinated Time (UTC).
getUTCDay Method	Returns the day of the week value in a Date object using Universal Coordinated Time (UTC).
getUTCFullYear Method	Returns the year value in a Date object using Universal Coordinated Time (UTC).
getUTCHours Method	Returns the hours value in a Date object using Universal Coordinated Time (UTC).
getUTCMilliseconds Method	Returns the milliseconds value in a Date object using Universal Coordinated Time (UTC).
getUTCMinutes Method	Returns the minutes value in a Date object using Universal Coordinated Time (UTC).
getUTCMonth Method	Returns the month value in a Date object using Universal Coordinated Time (UTC).
getUTCSeconds Method	Returns the seconds value in a Date object using Universal Coordinated Time (UTC).
getVarDate Method	Returns the VT_DATE value in a Date object.
getYear Method	Returns the year value in a Date object.
Global Object	An intrinsic object whose purpose is to collect global methods into one object.
Greater than Operator (>)	Compares two expressions to determine if one is greater than the other.
Greater than or equal to Operator (>=)	Compares two expressions to determine if one is greater than or equal to the other.
Identity Operator (===)	Compares two expressions to determine if they are equal in value and of the same data type.
@if Statement	Conditionally executes a group of statements, depending on the value of an expression.
if...else Statement	Conditionally executes a group of statements, depending on the value of an expression.
Increment Operator (++)	Increments a variable by one.
index Property	Returns the character position where the first successful match begins in a searched string.
indexOf Method	Returns the character position where the first occurrence of a substring occurs within a String object.
Inequality Operator (!=)	Compares two expressions to determine if they are unequal.
Infinity Property	Returns an initial value of Number.POSITIVE_INFINITY.
input Property	Returns the string against which a search was performed.
instanceof Operator	Returns a Boolean value that indicates whether or not an object is an instance of a particular class.
isFinite Method	Returns a Boolean value that indicates if a supplied number is finite.
isNaN Method	Returns a Boolean value that indicates whether a value is the reserved value NaN (not a number).
italics Method	Places HTML <I> tags around text in a String object.
item Method	Returns the current item in the collection.
join Method	Returns a String object consisting of all the elements of an array concatenated together.
Labeled Statement	Provides an identifier for a statement.
lastIndex Property	Returns the character position where the last successful match begins in a searched string.
lastIndexOf Method	Returns the last occurrence of a substring within a String object.
lbound Method	Returns the lowest index value used in the specified dimension of a VBArray.
length Property (Array)	Returns an integer value one higher than the highest element defined in an array.
length Property (Function)	Returns the number of arguments defined for a function.
length Property (String)	Returns the length of a String object.
Less than Operator (<)	Compares two expressions to determine if one is less than the other.
Less than or equal to Operator (<=)	Compares two expressions to determine if one is less than or equal to the other.
link Method	Places an HTML anchor with an HREF attribute around the text in a String object.
LN2 Property	Returns the natural logarithm of 2.
LN10 Property	Returns the natural logarithm of 10.
log Method	Returns the natural logarithm of a number.
LOG2E Property	Returns the base-2 logarithm of e, Euler's constant.
LOG10E Property	Returns the base-10 logarithm of e, Euler's constant.
Logical AND Operator (&&)	Performs a logical conjunction on two expressions.
Logical NOT Operator (!)	Performs logical negation on an expression.
Logical OR Operator (\|\|)	Performs a logical disjunction on two expressions.
match Method	Returns, as an array, the results of a search on a string using a supplied Regular Expression object.
Math Object	A intrinsic object that provides basic mathematics functionality and constants.
max Method	Returns the greater of two supplied numeric expressions.
MAX_VALUE Property	Returns the largest number that can be represented in JScript.
min Method	Returns the lesser of two supplied numbers.
MIN_VALUE Property	Returns the number closest to zero that can be represented in JScript.
Modulus Operator (%)	Divides two numbers and returns the remainder.
moveFirst Method	Resets the current item in the collection to the first item.
moveNext Method	Moves the current item to the next item in the collection.
Multiplication Operator (*)	Multiplies two numbers.
NaN Property (Global)	Returns the special value NaN indicating that an expression is not a number.
NaN Property (Number)	Returns the special value (NaN) indicating that an expression is not a number.
NEGATIVE_INFINITY Property	Returns a value more negative than the largest negative number (-Number.MAX_VALUE) that can be represented in JScript.
new Operator	Creates a new object.
Nonidentity Operator (!==)	Compares two expressions to determine if they are not equal in value or of the same data type.
Number Object	An object representation of the number data type and placeholder for numeric constants.
number Property	Returns or sets the numeric value associated with a specific error.
Object Object	Provides functionality common to all JavaScript objects.
Operator Precedence	List containing information about the execution precedence of JavaScript operators.
parse Method	Parses a string containing a date, and returns the number of milliseconds between that date and midnight, January 1, 1970.
parseFloat Method	Returns a floating-point number converted from a string.
parseInt Method	Returns an integer converted from a string.
PI Property	Returns the ratio of the circumference of a circle to its diameter, approximately 3.141592653589793.
POSITIVE_INFINITY Property	Returns a value larger than the largest number (Number.MAX_VALUE) that can be represented in JScript.
pow Method	Returns the value of a base expression raised to a specified power.
prototype Property	Returns a reference to the prototype for a class of objects.
random Method	Returns a pseudorandom number between 0 and 1.
RegExp Object	Stores information on regular expression pattern searches.
Regular Expression Object	Contains a regular expression pattern.
Regular Expression Syntax	A list of the special characters and sequences used in writing patterns for regular expressions.
replace Method	Returns a copy of a string with text replaced using a regular expression.
return Statement	Exits from the current function and returns a value from that function.
reverse Method	Returns an Array object with the elements reversed.
round Method	Returns a specified numeric expression rounded to the nearest integer.
Run-time Errors	List of JavaScript run-time errors.
ScriptEngine Function	Returns a string representing the scripting language in use.
ScriptEngineBuildVersion Function	Returns the build version number of the scripting engine in use.
ScriptEngineMajorVersion Function	Returns the major version number of the scripting engine in use.
ScriptEngineMinorVersion Function	Returns the minor version number of the scripting engine in use.
search Method	Returns the position of the first substring match in a regular expression search.
@set Statement	Creates variables used with conditional compilation statements.
setDate Method	Sets the numeric date of the Date object using local time.
setFullYear Method	Sets the year value in the Date object using local time.
setHours Method	Sets the hour value in the Date object using local time.
setMilliseconds Method	Sets the milliseconds value in the Date object using local time.
setMinutes Method	Sets the minutes value in the Date object using local time.
setMonth Method	Sets the month value in the Date object using local time.
setSeconds Method	Sets the seconds value in the Date object using local time.
setTime Method	Sets the date and time value in the Date object.
setUTCDate Method	Sets the numeric date in the Date object using Universal Coordinated Time (UTC).
setUTCFullYear Method	Sets the year value in the Date object using Universal Coordinated Time (UTC).
setUTCHours Method	Sets the hours value in the Date object using Universal Coordinated Time (UTC).
setUTCMilliseconds Method	Sets the milliseconds value in the Date object using Universal Coordinated Time (UTC).
setUTCMinutes Method	Sets the minutes value in the Date object using Universal Coordinated Time (UTC).
setUTCMonth Method	Sets the month value in the Date object using Universal Coordinated Time (UTC).
setUTCSeconds Method	Sets the seconds value in the Date object using Universal Coordinated Time (UTC).
setYear Method	Sets the year value in the Date object.
sin Method	Returns the sine of a number.
slice Method (Array)	Returns a section of an array.
slice Method (String)	Returns a section of a string.
small Method	Places HTML <SMALL> tags around text in a String object.
sort Method	Returns an Array object with the elements sorted.
source Property	Returns a copy of the text of the regular expression pattern.
split Method	Returns the array of strings that results when a string is separated into substrings.
sqrt Method	Returns the square root of a number.
SQRT1_2 Property	Returns the square root of 0.5, or one divided by the square root of 2.
SQRT2 Property	Returns the square root of 2.
strike Method	Places HTML <STRIKE> tags around text in a String object.
String Object	Allows manipulation and formatting of text strings and determination and location of substrings within strings.
sub Method	Places HTML <SUB> tags around text in a String object.
substr Method	Returns a substring beginning at a specified location and having a specified length.
substring Method	Returns the substring at a specified location within a String object.
Subtraction Operator (-)	Performs subtraction of two expressions.
sup Method	Places HTML <SUP> tags around text in a String object.
switch Statement	Enables the execution of one or more statements when a specified expression's value matches a label.
Syntax Errors	List of JavaScript run-time errors.
tan Method	Returns the tangent of a number.
test Method	Returns a Boolean value that indicates whether or not a pattern exists in a searched string.
this Statement	Refers to the current object.
throw Statement	Generates an error condition that can be handled by a try...catch statement.
toArray Method	Returns a standard JavaScript array converted from a VBArray.
toGMTString Method	Returns a date converted to a string using Greenwich Mean Time (GMT).
toLocaleString Method	Returns a date converted to a string using the current locale.
toLowerCase Method	Returns a string where all alphabetic characters have been converted to lowercase.
toString Method	Returns a string representation of an object.
toUpperCase Method	Returns a string where all alphabetic characters have been converted to uppercase.
toUTCString Method	Returns a date converted to a string using Universal Coordinated Time (UTC).
try Statement	Implements error handling for JScript.
typeof Operator	Returns a string that identifies the data type of an expression.
ubound Method	Returns the highest index value used in the specified dimension of the VBArray.
Unary Negation Operator (-)	Indicates the negative value of a numeric expression.
unescape Method	Decodes String objects encoded with the escape method.
Unsigned Right Shift Operator (>>>)	Performs an unsigned right shift of the bits in an expression.
UTC Method	Returns the number of milliseconds between midnight, January 1, 1970 Universal Coordinated Time (UTC) (or GMT) and the supplied date.
valueOf Method	Returns the primitive value of the specified object.
var Statement	Declares a variable.
VBArray Object	Provides access to Visual Basic safe arrays.
void Operator	Prevents an expression from returning a value.
while Statement	Executes a statement until a specified condition is false.
with Statement	Establishes the default object for a statement.

Language Element	Description
GetObject Function	Returns a reference to an Automation object from a file.
ScriptEngine Function	Returns a string representing the scripting language in use.
ScriptEngineBuildVersion Function	Returns the build version number of the scripting engine in use.
ScriptEngineMajorVersion Function	Returns the major version number of the scripting engine in use.
ScriptEngineMinorVersion Function	Returns the minor version number of the scripting engine in use.

Language Element	Description
abs Method	Returns the absolute value of a number.
acos Method	Returns the arccosine of a number.
anchor Method	Places an HTML anchor with a NAME attribute around specified text in the object.
asin Method	Returns the arcsine of a number.
atan Method	Returns the arctangent of a number.
atan2 Method	Returns the angle (in radians) from the X axis to a point (y,x).
atEnd Method	Returns a Boolean value indicating if the enumerator is at the end of the collection.
big Method	Places HTML <BIG> tags around text in a String object.
blink Method	Places HTML <BLINK> tags around text in a String object.
bold Method	Places HTML <B> tags around text in a String object.
ceil Method	Returns the smallest integer greater than or equal to its numeric argument.
charAt Method	Returns the character at the specified index.
charCodeAt Method	Returns the Unicode encoding of the specified character.
compile Method	Compiles a regular expression into an internal format.
concat Method (Array)	Returns a new array consisting of a combination of two arrays.
concat Method (String)	Returns a String object containing the concatenation of two supplied strings.
cos Method	Returns the cosine of a number.
dimensions Method	Returns the number of dimensions in a VBArray.
escape Method	Encodes String objects so they can be read on all computers.
eval Method	Evaluates JavaScript code and executes it.
exec Method	Executes a search for a match in a specified string.
exp Method	Returns e (the base of natural logarithms) raised to a power.
fixed Method	Places HTML <TT> tags around text in a String object.
floor Method	Returns the greatest integer less than or equal to its numeric argument.
fontcolor Method	Places an HTML <FONT> tag with the COLOR attribute around the text in a String object.
fontsize Method	Places an HTML <FONT> tag with the SIZE attribute around the text in a String object.
fromCharCode Method	Returns a string from a number of Unicode character values.
getDate Method	Returns the day of the month value in a Date object using local time.
getDay Method	Returns the day of the week value in a Date object using local time.
getFullYear Method	Returns the year value in the Date object using local time.
getHours Method	Returns the hours value in a Date object using local time.
getItem Method	Returns the item at the specified location.
getMilliseconds Method	Returns the milliseconds value in a Date object using local time.
getMinutes Method	Returns the minutes value stored in a Date object using local time.
getMonth Method	Returns the month value in the Date object using local time.
getSeconds Method	Returns seconds value stored in a Date object using local time.
getTime Method	Returns the time value in a Date object.
getTimezoneOffset Method	Returns the difference in minutes between the time on the host computer and Universal Coordinated Time (UTC).
getUTCDate Method	Returns the date value in a Date object using Universal Coordinated Time (UTC).
getUTCDay Method	Returns the day of the week value in a Date object using Universal Coordinated Time (UTC).
getUTCFullYear Method	Returns the year value in a Date object using Universal Coordinated Time (UTC).
getUTCHours Method	Returns the hours value in a Date object using Universal Coordinated Time (UTC).
getUTCMilliseconds Method	Returns the milliseconds value in a Date object using Universal Coordinated Time (UTC).
getUTCMinutes Method	Returns the minutes value in a Date object using Universal Coordinated Time (UTC).
getUTCMonth Method	Returns the month value in a Date object using Universal Coordinated Time (UTC).
getUTCSeconds Method	Returns the seconds value in a Date object using Universal Coordinated Time (UTC).
getVarDate Method	Returns the VT_DATE value in a Date object.
getYear Method	Returns the year value in a Date object.
indexOf Method	Returns the character position where the first occurrence of a substring occurs within a String object.
isFinite Method	Returns a Boolean value that indicates if a supplied number is finite.
isNaN Method	Returns a Boolean value that indicates whether a value is the reserved value NaN (not a number).
italics Method	Places HTML <I> tags around text in a String object.
item Method	Returns the current item in the collection.
join Method	Returns a String object consisting of all the elements of an array concatenated together.
lastIndexOf Method	Returns the last occurrence of a substring within a String object.
lbound Method	Returns the lowest index value used in the specified dimension of a VBArray.
link Method	Places an HTML anchor with an HREF attribute around the text in a String object.
log Method	Returns the natural logarithm of a number.
match Method	Returns, as an array, the results of a search on a string using a supplied Regular Expression object.
max Method	Returns the greater of two supplied numeric expressions.
min Method	Returns the lesser of two supplied numbers.
moveFirst Method	Resets the current item in the collection to the first item.
moveNext Method	Moves the current item to the next item in the collection.
parse Method	Parses a string containing a date, and returns the number of milliseconds between that date and midnight, January 1, 1970.
parseFloat Method	Returns a floating-point number converted from a string.
parseInt Method	Returns an integer converted from a string.
pow Method	Returns the value of a base expression raised to a specified power.
random Method	Returns a pseudorandom number between 0 and 1.
replace Method	Returns a copy of a string with text replaced using a regular expression.
reverse Method	Returns an Array object with the elements reversed.
round Method	Returns a specified numeric expression rounded to the nearest integer.
search Method	Returns the position of the first substring match in a regular expression search.
setDate Method	Sets the numeric date of the Date object using local time.
setFullYear Method	Sets the year value in the Date object using local time.
setHours Method	Sets the hour value in the Date object using local time.
setMilliseconds Method	Sets the milliseconds value in the Date object using local time.
setMinutes Method	Sets the minutes value in the Date object using local time.
setMonth Method	Sets the month value in the Date object using local time.
setSeconds Method	Sets the seconds value in the Date object using local time.
setTime Method	Sets the date and time value in the Date object.
setUTCDate Method	Sets the numeric date in the Date object using Universal Coordinated Time (UTC).
setUTCFullYear Method	Sets the year value in the Date object using Universal Coordinated Time (UTC).
setUTCHours Method	Sets the hours value in the Date object using Universal Coordinated Time (UTC).
setUTCMilliseconds Method	Sets the milliseconds value in the Date object using Universal Coordinated Time (UTC).
setUTCMinutes Method	Sets the minutes value in the Date object using Universal Coordinated Time (UTC).
setUTCMonth Method	Sets the month value in the Date object using Universal Coordinated Time (UTC).
setUTCSeconds Method	Sets the seconds value in the Date object using Universal Coordinated Time (UTC).
setYear Method	Sets the year value in the Date object.
sin Method	Returns the sine of a number.
slice Method (Array)	Returns a section of an array.
slice Method (String)	Returns a section of a string.
small Method	Places HTML <SMALL> tags around text in a String object.
sort Method	Returns an Array object with the elements sorted.
split Method	Returns the array of strings that results when a string is separated into substrings.
sqrt Method	Returns the square root of a number.
strike Method	Places HTML <STRIKE> tags around text in a String object.
sub Method	Places HTML <SUB> tags around text in a String object.
substr Method	Returns a substring beginning at a specified location and having a specified length.
substring Method	Returns the substring at a specified location within a String object.
sup Method	Places HTML <SUP> tags around text in a String object.
tan Method	Returns the tangent of a number.
test Method	Returns a Boolean value that indicates whether or not a pattern exists in a searched string.
toArray Method	Returns a standard JavaScript array converted from a VBArray.
toGMTString Method	Returns a date converted to a string using Greenwich Mean Time (GMT).
toLocaleString Method	Returns a date converted to a string using the current locale.
toLowerCase Method	Returns a string where all alphabetic characters have been converted to lowercase.
toString Method	Returns a string representation of an object.
toUpperCase Method	Returns a string where all alphabetic characters have been converted to uppercase.
toUTCString Method	Returns a date converted to a string using Universal Coordinated Time (UTC).
ubound Method	Returns the highest index value used in the specified dimension of the VBArray.
unescape Method	Decodes String objects encoded with the escape method.
UTC Method	Returns the number of milliseconds between midnight, January 1, 1970 Universal Coordinated Time (UTC) (or GMT) and the supplied date.
valueOf Method	Returns the primitive value of the specified object.

Language Element	Description
ActiveXObject Object	Enables and returns a reference to an Automation object.
Array Object	Provides support for creation of arrays of any data type.
Boolean Object	Creates a new Boolean value.
Date Object	Enables basic storage and retrieval of dates and times.
Dictionary Object	Object that stores data key, item pairs.
Enumerator Object	Enables enumeration of items in a collection.
Error Object	An object that contains information about errors that occur while JavaScript code is running.
FileSystemObject Object	Provides access to a computer's file system.
Function Object	Creates a new function.
Global Object	An intrinsic object whose purpose is to collect global methods into one object.
Math Object	A intrinsic object that provides basic mathematics functionality and constants.
Number Object	An object representation of the number data type and placeholder for numeric constants.
Object Object	Provides functionality common to all JavaScript objects.
RegExp Object	Stores information on regular expression pattern searches.
Regular Expression Object	Contains a regular expression pattern.
String Object	Allows manipulation and formatting of text strings and determination and location of substrings within strings.
VBArray Object	Provides access to Visual Basic safe arrays.

Language Element	Description
Addition Operator (+)	Sums two numbers or concatenates two strings.
Assignment Operator (=)	Assigns a value to a variable.
Bitwise AND Operator (&)	Performs a bitwise AND on two expressions.
Bitwise Left Shift Operator (<<)	Shifts the bits of an expression to the left.
Bitwise NOT Operator (~)	Performs a bitwise NOT (negation) on an expression.
Bitwise OR Operator (\|)	Performs a bitwise OR on two expressions.
Bitwise Right Shift Operator (>>)	Shifts the bits of an expression to the right, maintaining sign.
Bitwise XOR Operator (^)	Performs a bitwise exclusive OR on two expressions.
Comma Operator (,)	Causes two expressions to be executed sequentially.
Comparison Operators	Returns a Boolean value indicating the result of the comparison.
Compound Assignment Operators	List of compound assignment operators.
Conditional (trinary) Operator (?:)	Executes one of two expressions depending on a condition.
Decrement Operator (--)	Decrements a variable by one.
delete Operator	Deletes a property from an object, or removes an element from an array.
Division Operator (/)	Divides two numbers and returns a numeric result.
Equality Operator (==)	Compares two expressions to determine if they are equal.
Greater than Operator (>)	Compares two expressions to determine if one is greater than the other.
Greater than or equal to Operator (>=)	Compares two expressions to determine if one is greater than or equal to the other.
Identity Operator (===)	Compares two expressions to determine if they are equal in value and of the same data type.
Increment Operator (++)	Increments a variable by one.
Inequality Operator (!=)	Compares two expressions to determine if they are unequal.
instanceof Operator	Returns a Boolean value that indicates whether or not an object is an instance of a particular class.
Less than Operator (<)	Compares two expressions to determine if one is less than the other.
Less than or equal to Operator (<=)	Compares two expressions to determine if one is less than or equal to the other.
Logical AND Operator (&&)	Performs a logical conjunction on two expressions.
Logical NOT Operator (!)	Performs logical negation on an expression.
Logical OR Operator (\|\|)	Performs a logical disjunction on two expressions.
Modulus Operator (%)	Divides two numbers and returns the remainder.
Multiplication Operator (*)	Multiplies two numbers.
new Operator	Creates a new object.
Nonidentity Operator (!==)	Compares two expressions to determine that they are not equal in value or of the same data type.
Operator Precedence	List containing information about the execution precedence of JavaScript operators.
Subtraction Operator (-)	Performs subtraction of two expressions.
typeof Operator	Returns a string that identifies the data type of an expression.
Unary Negation Operator (-)	Indicates the negative value of a numeric expression.
Unsigned Right Shift Operator (>>>)	Performs an unsigned right shift of the bits in an expression.
void Operator	Prevents an expression from returning a value.

Language Element	Description
$1...$9 Properties	Returns the nine most-recently memorized portions found during pattern matching.
arguments Property	Returns an array containing each argument passed to the currently executing function.
caller Property	Returns a reference to the function that invoked the current function.
constructor Property	Specifies the function that creates an object.
description Property	Returns or sets the descriptive string associated with a specific error.
E Property	Returns Euler's constant, the base of natural logarithms.
index Property	Returns the character position where the first successful match begins in a searched string.
Infinity Property	Returns an initial value of Number.POSITIVE_INFINITY.
input Property	Returns the string against which a search was performed.
lastIndex Property	Returns the character position where the last successful match begins in a searched string.
length Property (Array)	Returns an integer value one higher than the highest element defined in an array.
length Property (Function)	Returns the number of arguments defined for a function.
length Property (String)	Returns the length of a String object.
LN2 Property	Returns the natural logarithm of 2.
LN10 Property	Returns the natural logarithm of 10.
LOG2E Property	Returns the base-2 logarithm of e, Euler's constant.
LOG10E Property	Returns the base-10 logarithm of e, Euler's constant.
MAX_VALUE Property	Returns the largest number that can be represented in JScript.
MIN_VALUE Property	Returns the number closest to zero that can be represented in JScript.
NaN Property (Global)	Returns the special value NaN indicating that an expression is not a number.
NaN Property (Number)	Returns the special value (NaN) indicating that an expression is not a number.
NEGATIVE_INFINITY Property	Returns a value more negative than the largest negative number (-Number.MAX_VALUE) that can be represented in JScript.
number Property	Returns or sets the numeric value associated with a specific error.
PI Property	Returns the ratio of the circumference of a circle to its diameter, approximately 3.141592653589793.
POSITIVE_INFINITY Property	Returns a value larger than the largest number (Number.MAX_VALUE) that can be represented in JScript.
prototype Property	Returns a reference to the prototype for a class of objects.
source Property	Returns a copy of the text of the regular expression pattern.
SQRT1_2 Property	Returns the square root of 0.5, or one divided by the square root of 2.
SQRT2 Property	Returns the square root of 2.

Language Element	Description
break Statement	Terminates the current loop, or if in conjunction with a label, terminates the associated statement.
catch Statement	Contains statements to execute when an error occurs in code within the try block.
@cc_on Statement	Activates conditional compilation support.
// (Single-line Comment Statement)	Causes single-line comments to be ignored by the JavaScript parser.
/../ (Multiline Comment Statement)	Causes multiline comments to be ignored by the JavaScript parser.
continue Statement	Stops the current iteration of a loop, and starts a new iteration.
do...while Statement	Executes a statement block once, and then repeats execution of the loop until a condition expression evaluates to false.
for Statement	Executes a block of statements for as long as a specified condition is true.
for...in Statement	Executes one or more statements for each element of an object or array.
function Statement	Declares a new function.
@if Statement	Conditionally executes a group of statements, depending on the value of an expression.
if...else Statement	Conditionally executes a group of statements, depending on the value of an expression.
Labeled Statement	Provides an identifier for a statement.
return Statement	Exits from the current function and returns a value from that function.
@set Statement	Creates variables used with conditional compilation statements.
switch Statement	Enables the execution of one or more statements when a specified expression's value matches a label.
this Statement	Refers to the current object.
throw Statement	Generates an error condition that can be handled by a try...catch statement.
try Statement	Implements error handling for JScript.
var Statement	Declares a variable.
while Statement	Executes a statement until a specified condition is false.
with Statement	Establishes the default object for a statement.

Language Element	Description
Run-time Errors	List of JavaScript run-time errors
Syntax Errors	List of JavaScript syntax errors

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