How to use the function of bind

The usage of bind is to define a specified scope for called function. Because the key this is easy to refer another objet, experically window, instead of itself. Please pay attention to look at the following example:

 //Global variables

 window.name="Chromium";

 var person={

   name:"Pin"

 }

 function say()

 {

    alert("My name is "+this.name+"!");

 }

 say(); //the result is : My name is Chromium!

 var sayfunction=say.bind(person);

 sayfunction(); //the result is : My name is Pin!

When the function say assign to a variable sayfunction, the scope of this function has been changed. However, if you use the function of bind to refer a specified object person, the scope will own the refer object person.

巴特西

How to use the function of bind

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