This--Apply or call

Both the apply and call methods can toggle the context in which the function executes, that is, the object that changes this binding. Apply and call are similar, except that one requirement is an array when passing in parameters, and one requirement is to be passed in separately. So let's take the example of apply :

var name = "Window";         var someone = {      "Bob",      function() {          alert (this  . Name);      }  ;     var other = {      "Tom"  };        Someone.showname ();      // Bob   Someone.showName.apply ();    // window   Someone.showName.apply (other);    // Tom  

As you can see, when you access the method in the object normally, this points to the object. When apply is used, the current object of this is global, and when apply has parameters, this is the current object of this parameter.

This--Apply or call