Example of a Boolean object initial value for JS

Source: Internet
Author: User

 boolean (logical) objects are used to convert an illogical value to a logical value (TRUE or false) let's introduce the Boolean object initial value of JS below

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, the value of the object is false. Otherwise, the value is true even when the argument is string "false"! All lines of code below     Create a Boolean object with the initial value of false.   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 results:    false  false  false  false  false  false    All code lines below will have the initial value of True Boolean Object:    code is 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>    Operation results:    true  true  true  true  true  GuanIn this initial value and Java and C are not the same, later write the attention of the receptionist Ah!    

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