Understand the call () and apply () in JS

In fact, understanding call and apply the most important thing is to know why we use these two methods.

Suppose that there is a situation where:

Function Man () {}
cat.prototype={     
Sex: "Man",     
Say:function () {           
Alert ("I AM" +this.sex);     
}
}

var tallman = new Man;
Tallman.say ();

This is the OOP we used to use. Suppose now that I want to set a woman object, but the method about say does not want to be redefined, this can take the say method of the cat directly, how to invoke, is to use the call and apply method.

Put the difference between call and apply, we can Baidu by ourselves.

Understand the call () and apply () in JS