In addition, objects can now be creating using literal notation.

Creating Objects With Literal Notation

In addition to creating an object using its constructor function, you can create it using literal notation.

Syntax

objectName = {property1:value1, property2:value2,..., propertyn:valuen}

Properties

objectName is the name of the new object

Description

If an object is created using literal notation in a top-level script, JavaScript interprets the object each time it evaluates the expression containing the object literal. In addition, a literal used in a function is created each time the function is called.

if (cond) x = {hi:"there"}

In this case, JavaScript makes the literal object and assigns it to the variable x if and only if the expression cond is true.

Example

The following example creates myHonda with three properties. Note that the engine property is also an object with its own properties.

myHonda = {color:"red",wheels:4,engine:{cylinders:4,size:2.2}}

arguments

For example, the following script demonstrates several of the arguments properties:

<SCRIPT LANGUAGE="JavaScript1.2"> 

function b(z) { 
   document.write(arguments.z + "<BR>") 
   document.write (arguments.caller.x + "<BR>") 
   return 99 
} 

function a(x, y) { 
   return  b(534) 
}

document.write (a(2,3) + "<BR>") 

</SCRIPT>

This writes:

Number

Core object. Number(x) now produces NaN rather than an error if x is a string that does not contain a well-formed numeric literal. For example,

x=Number("three");
document.write(x + "<BR>");

prints NaN

screen

Client-side object. Contains information about the display screen resolution and colors.

Syntax

screen.propertyName

Parameters

propertyName is one of the properties listed below.

Property of

None

Properties

Methods and Properties

None