for Window

github: https://github.com/laixiangran/commonJS/blob/master/src/forWindow.js

代码

/*** Created by laixiangran on 2016/1/24* homepage：http://www.cnblogs.com/laixiangran/* for Window*/
(function() {var com = window.COM = window.COM || {};com.$W = {/*** 在window.onload前执行，相当于jq的ready()* 使用domReady.ready()将执行函数加入队列中**/domReady: (function() {// 用于添加要执行的函数var domReady = function() {var fnArr = Array.prototype.slice.call(arguments);// 页面如果加载完毕则直接运行if (domReady.isReady) {fnArr.forEach(function(fn) {fn();});}else {domReady.fns = fnArr;}};// 用于判定页面是否加载完毕domReady.isReady = false;domReady.fns = [];// 执行所有在window.onload之前放入的函数domReady.fireReady = function() {if (!domReady.isReady) {if (!document.body) {return setTimeout(domReady.fireReady, 16);}domReady.isReady = true;if (domReady.fns.length) {domReady.fns.forEach(function(fn) {fn();});}}};// 开始初始化domReady函数，判定页面的加载情况if (document.readyState === "complete") {domReady.fireReady();} else if (-[1,]) {document.addEventListener("DOMContentLoaded", function() {document.removeEventListener("DOMContentLoaded", arguments.callee, false);domReady.fireReady();}, false);} else {// 当页面包含图片时，onreadystatechange事件会触发在window.onload之后，// 换言之，它只能正确地执行于页面不包含二进制资源或非常少或者被缓存时document.attachEvent("onreadystatechange", function() {if (document.readyState == "complete") {document.detachEvent("onreadystatechange", arguments.callee);domReady.fireReady();}});(function(){if (domReady.isReady) {return;}// doScroll存在于所有标签而不管其是否支持滚动条// 这里如果用document.documentElement.doScroll()，我们需要判定其是否位于顶层documentvar node = new Image();try {node.doScroll();node = null; // 防止IE内存泄漏}catch (e) {// javascrpt最短时钟间隔为16ms，这里取其倍数setTimeout(arguments.callee, 64);return;}domReady.fireReady();})();}return domReady;}()),/*** requestAnimationFrame兼容性扩展，两方面工作：* 1、把各浏览器前缀进行统一* 2、在浏览器没有requestAnimationFrame方法时将其指向setTimeout方法* */requestAnimationFrame: (function() {var func = null;var lastTime = 0;var vendors = ["webkit", "moz"];for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {func = window[vendors[x] + "RequestAnimationFrame"];}if (!func) {func = function(callback, element) {var currTime = new Date().getTime();var timeToCall = Math.max(0, 16.7 - (currTime - lastTime));var id = window.setTimeout(function() {callback(currTime + timeToCall);}, timeToCall);lastTime = currTime + timeToCall;return id;};}return func;}()),// 取消AnimationFramecancelAnimationFrame: (function() {var func = null;var vendors = ["webkit", "moz"];for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {// Webkit中此取消方法的名字变了window.cancelAnimationFrame = window[vendors[x] + "CancelAnimationFrame"] || window[vendors[x] + "CancelRequestAnimationFrame"];}if (!func) {func = function(id) {window.clearTimeout(id);};}return func;}())};
}());

参考

http://www.cnblogs.com/cloudgamer/