The Boolean object initial value of JS example _javascript tips

A Boolean (logical) object is used to convert a non logical value to a logical value (TRUE or false).
Create a Boolean object

Use keyword new to define a Boolean object. The following code defines a logical object named Myboolean:

var myboolean=new Boolean ()

Note: If the logical object has no initial value or its value is 0,-0, NULL, "", false, undefined, or NaN, then the value of the object is false. Otherwise, the value is true even when the argument is string "false"!

All of the following lines of code create a Boolean object with the initial value of false.

Copy Code code as follows:

<script type= "Text/javascript" >
var myboolean=new Boolean ();
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean (0);
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean (NULL);
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean ("");
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean (false);
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean (NaN);
document.write (Myboolean);
document.write ("<br/>");
</script>

Run Result:

False
False
False
False
False
False

All of the following lines of code will create a Boolean object with the initial value of true:

Copy Code code as follows:

<script type= "Text/javascript" >
var myboolean=new Boolean (1);
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean (True);
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean ("true");
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean ("false");
document.write (Myboolean);
document.write ("<br/>");

var myboolean=new Boolean ("Bill Gates");
document.write (Myboolean);
document.write ("<br/>");
</script>

Run Result:

True
True
True
True
True
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