A Boolean object is used to convert a nonlogical value to a logical value (true or false). Creating a Boolean object

Use the keyword new to define a Boolean object. The following code defines a logical object called myBoolean:

Var myBoolean = new Boolean ()

Comment: the value of a logical object is false if it has no initial value or if its value is 0, -0, null, "", false, undefined, or NaN. Otherwise, the value is true (even when the argument is the string “false”)!

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

<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>

Operation results:

false false false false false false

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

<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>

Operation results:

True, True, True, True, True, About this initial value and Java and c are not the same, later write foreground attention!