JS function definition functions using _javascript tips

Source: Internet
Author: User
Tags function definition
1. The most basic function declared as a Benbon is used.
Copy Code code as follows:

function func () {}
var func=function () {};

2. Use as a class Builder:
Copy Code code as follows:

function class () {}
var item=new class ();

3. Use as closures:
Copy Code code as follows:

(function () {
Independent scopes

4. Can be used as a selector:
Copy Code code as follows:

var addevent=new function () {
if (!-[1,]) return function (Elem,type,func) {attachevent (Elem, ' on ' +type,func);
else return function (Elem,type,func) {AddEventListener (elem,type,func,false);}
};//avoids repetitive judgments.

5. Mixed applications in the above four situations:
Copy Code code as follows:

var class=new function () {
var privatearg;//static Private variable
function Privatemethod=function () {};//static Private method
return function () {//* true constructor/};

6. Use function to handle the JS script returned by Ajax:
Copy Code code as follows:

var ajax_js_code=
"{A: ' A ', ' B ': ' B ', ' Func ': function () {alert (' abc ')}}";
Suppose this returns responsetext for the server
"Return" +ajax_js_code;
Refactoring the body of the code to have different refactoring methods as needed
var ajax_exec=new Function (Ajax_js_code);
var result=ajax_exec ();
Alert (result.a+ ":" +result.b);
Result.func ();

This build function mode: var func=new function (args1,args2,args3,..., body) args: parameters (any number); Body: function Principal
such as: Var func=new Function ("Arg1", "arg2", "Alert (arg1+ ': ' +arg2 ')"); Func ("Ooo", "PPP");
It should be noted that note that the return code format, depending on the principle of return form can be a few:
Copy Code code as follows:

1. (function () {//code}) ()
2.{a: "abc", func:function) {}}//hash list
3.function () {}

The above three should be able to handle most of the code.

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