The definition and invocation method of JS function

JS function calls four ways: method call pattern, function call pattern, constructor call pattern, Apply,call call pattern

1. Method Invocation Mode:
Define an object first, then define the method in the object's properties, execute the method through Myobject.property, this refers to the current MyObject
Object.
var bloginfo={
Blogid:123,
Blogname: "WERWR",
Showblog:function () {alert (this.blogid);}
};

Bloginfo.showblog ();

2. Function call mode
Define a function, set a variable name to save the function, and this point points to the Window object.

var myfunc = function (A, b) {
return a+b;
}

Alert (MyFunc (3,4));

3. Constructor invocation mode
Defines a function object, defines the property in the object, and defines the method in its prototype object. When you use the prototype method, you must instantiate the object to invoke its method.
var myfunc = function (a) {
THIS.A = A;
};
Myfunc.prototype = {
Show:function () {alert (THIS.A);}
}

var newfunc = new MyFunc ("123123123");
Newfunc.show ();

4.apply,call Call pattern
var myobject={};
var sum = function (A, b) {
return a+b;
};
var sum2 = Sum.call (myobject,10,30); var sum2 = sum.apply (myobject,[10,30]);
alert (SUM2);

Source: http://www.cnblogs.com/zourong/p/3897848.html

The definition and invocation method of JS function