JavaScript in this

This in the JS function points to the problem: (This object is bound at run time based on the function's execution environment)

Unlike normal variable fetching, the intrinsic function searches only for its active object when searching for both this and arguments variables, so this cannot be passed into an intrinsic function like a normal variable.

1. When a function is called as a method of an object, this points to the object

var a={

Name: ' Xiao Han ',

Getname:function () {

Console.log (this.name);

}

}

A.getname (); Xiao Han

2. When the function is called as an anonymous function, this points to the global window

3. Special case, use call,apply to change this point

var b={

Name: "Xiao Wang"

}

A.getname.call (b); Xiao Wang

JavaScript in this