Created
April 2, 2014 03:03
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异步顺序加载JS脚本
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| var WebCommon = (function (func) { | |
| return func(WebCommon || {}, $); | |
| }).call(this, function (wc, $, undefined) { | |
| var | |
| // 获取指定param的查询字符串值 | |
| query = function (param) { | |
| var match = RegExp('[?&]' + param + '=([^&]*)').exec(location.href.split('#')[0]); | |
| return match && decodeURIComponent(match[1].replace(/\+/g, ' ')); | |
| }, | |
| // 简单模板方法 | |
| vsub = function (tmpl, vector) { | |
| return ('' + tmpl).replace(/\$\{([^\{\}]+)\}/g, function (_, p) { | |
| return (vector || {})[p] || ''; | |
| }); | |
| }, | |
| // 结构化执行匿名函数 | |
| exec = function () { | |
| var args = []; | |
| args = args.concat.apply(args, args.slice.call(arguments)); | |
| return args.pop().apply(null, args); | |
| }, | |
| // 加载指定url的脚本文件 | |
| getScript = function (url) { | |
| var dfd = $.Deferred(), | |
| cache = +new Date / 600000 >>> 0, | |
| script = document.createElement('script'); | |
| url += (url.indexOf('?') > 0 ? '&' : '?') + 'cache=' + cache; | |
| script.async = true; | |
| script.src = url; | |
| $('head').eq(0).append(script); | |
| var $script = $(script).on('load', dfd.resolve) | |
| .on('error', dfd.reject); | |
| return dfd.always(function () { | |
| $script.remove(); | |
| $script = null; | |
| }).promise(); | |
| }, | |
| // uncommit next line if worked with jquery(>=1.8) | |
| // getScript = $.getScript, | |
| memorizeProm = function (func) { | |
| var promCache = {}; | |
| return function (arg) { | |
| if (!promCache.hasOwnProperty(arg)) { | |
| promCache[arg] = $.when(func(arg)).promise(); | |
| } | |
| return promCache[arg]; | |
| }; | |
| }, | |
| // memoized `getScript` | |
| memoget = memorizeProm(getScript), | |
| result = function(func, args) { | |
| return function() { | |
| return func.apply(null, args); | |
| }; | |
| }, | |
| // realize promises one by one | |
| sync = function (tasks) { | |
| var | |
| i, l, task, func, | |
| prom = $.Deferred().resolve().promise(); | |
| for (i = 0, l = tasks.length; i < l; i += 1) { | |
| task = tasks[i]; | |
| func = task.shift(); | |
| prom = prom.then(result(func, task)); | |
| } | |
| return prom; | |
| }, | |
| // sequence load scripts | |
| succ = function (/*scripts*/) { | |
| var scripts = [], scriptProms = []; | |
| scripts = scripts.concat.apply(scripts, scripts.slice.call(arguments)); | |
| $.each(scripts, function (index, script) { | |
| scriptProms[index] = [memoget, script]; | |
| }); | |
| return sync(scriptProms); | |
| }; | |
| return $.extend(wc, { | |
| query: query, | |
| vsub : vsub, | |
| exec : exec, | |
| succ : succ, | |
| when : $.when | |
| }); | |
| }); |
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