"JavaScript" [bind,call,apply] (function cal () {} ()); declaring the function to execute immediately

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1. js function calls have 4 modes: Method invocation, normal function call, constructor function call, Apply/call call.
At the same time, no matter what function call except for the formal parameters that you define when you declare, you will automatically add 2 parameters, respectively this and arguments

。
2, the Apply:apply function receives 2 parameters, the first one is passed to this function to bind the value of this, the second is a parameter
Array.

Call and apply exist in order to change the binding of this.
Note: The difference is that the call is followed by an indeterminate argument, not an array.
Look at the code:

    function A (xx, yy) {             alert (xx, yy);             Alert (this);             alert (arguments);    }    A.apply (null, [5, +]);    A.call (null

3. Call and apply will execute the function immediately, and the second bind will not, it will generate a new function.
Other and call look, see the code:

var m = {            "x": 1    };     function foo (y) {        alert (this. x+ y);    }    Foo.apply (M, [5]);     5);     var foo1 = Foo.bind (M, 5);    

Clairvoyant

Source: http://rangercyh.blog.51cto.com

"JavaScript" [bind,call,apply] (function cal () {} ()); declaring the function to execute immediately