The definition and calling method of JS function recommendation _javascript Tips

Four methods of JS function invocation: Method invocation mode, function call pattern, constructor invocation pattern, Apply,call invocation pattern

1. Method invocation Pattern:

The current MyObject object is defined by defining an object and then defining the method in the object's properties by Myobject.property to execute the method.

var bloginfo={
blogid:123,
blogname: "WERWR",
showblog:function () {alert (this.blogid);}
;

Bloginfo.showblog ();

2. Function call mode

Define a function, set a variable name save function, then this point to the Window object.

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

Alert (MyFunc (3,4));

3. Constructor call pattern

Defines a function object, defines a property in an object, and defines a method in its prototype object. When you use the prototype method, you must instantiate the object to invoke its methods.

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 mode

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);

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