模块加载系统
模块加载系统初尝版，2个暴露函数：
加载模块:require(requireLists,callback);
require(['core','dom/selector'],function(){
//coding here,
//callbacks
})
定义模块:define(id,requireLists,callback);
define('id',['core','dom/selector'],function(){
//coding here
//callbacks
})
View Code
1 (function(win) {
2 loadedModules = {};
3 var reg_module_name = /(?:^|\/)([^(\/]+)$/;
4 function require(modules, callback) {
5 var moduleNames = [],
6 self = arguments.callee;
7 for (var i = 0, l = modules.length; i < l; i++) {
8 var matt = modules[i].match(reg_module_name);
9 moduleNames.push(matt[1]);
10 if (! (matt[1] in loadedModules) && ! detectExist(modules[i])) {
11 appendScript(modules[i]);
12 }
13 }
14 detectLoads(moduleNames, callback);
15 }
16 function define(id, requireModules, callback) {
17 require(requireModules, function() {
18 callback();
19 loadedModules[id] = 1;
20 })
21 }
22 function detectExist(module) {
23 var exist = false,
24 scripts = document.getElementsByTagName("script");
25 for (var i = 0, l = scripts.length; i < l; i++) {
26 if (scripts[i].getAttribute("src") === module + ".js") {
27 exist = true;
28 break;
29 }
30 }
31 return exist;
32 }
33 function appendScript(module) {
34 var script = document.createElement("script");
35 script.setAttribute("charset", "utf-8");
36 script.setAttribute("defer", true);
37 script.setAttribute("src", module + ".js");
38 document.getElementsByTagName("head")[0].appendChild(script);
39 }
40 function detectLoads(modules, callback) {
41 var flag = true,
42 args = arguments,
43 fn = args.callee;
44 for (var i = 0, l = modules.length, el; i < l; i++) {
45 el = modules[i];
46 if (!loadedModules[el]) {
47 flag = false;
48 break;
49 }
50 }
51 if (flag) {
52 callback();
53 } else {
54 setTimeout(function() {
55 fn.apply(null, args);
56 });
57 }
58 }
59 win.require = require;
60 win.define = define;
61 })(this);
