JavaScript must Know (c) String. How to come from _javascript tips

String

We know that JavaScript includes: number,string,boolean,null,undefined base Type and object type.

In my cognition, the method attribute should be an object that can have it.

var str= "Hello,world";
var s=str.substring (,);//ell

In terms of the return type above, str is of type string.

Look at the following how to declare a string using a global object.

var c=new String (str);

So can I think: when I'm dealing with strings,

The JavaScript compiler first uses the STR string, using the new String (str), and becomes the object. It then invokes its approach, and then returns a string using the ToString () method.

Creation and destruction of temporary objects

From the example above I know that JavaScript creates temporary objects when processing strings and Number,boolean, and then destroys them.

var a = "Hello,world";
var c = new String (a); Created a String object.
C.len =;
Alert (typeof (c));//object;
alert (C.len);//
///////////////////////////////////////////////////////////////////////
a.len=;

The A.len compiler did not make an error because the temporary object created was destroyed after the operation was completed.

= = and = =

A==c;//true;

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