为旧浏览器添加新特性-阿里云开发者社区

理论上如果浏览器的库功能足够强大，是完全可可以代替第三方的库。事实上各家浏览器都在不断增强自家浏览器的特性一些群众呼声较高的功能或者 API 已经早早加入到浏览器标准规范中，直接调用即可。问题是，许多客户因为种种原因没有升级它们的浏览器，造成开发者面对此类的问题时候，只能采取第三方库或“打补丁”的方式兼容，所谓”Polyfill“ 正是如此。笔者较倾向于“打补丁”的方式，也就是编写补丁的时候，其接口尽量与标准规范的一致。这样的好处当然是兼容了新的通用方式，API 更显一致。

语言增强

控制台

首先是调试用的方法 console.log()/dir()/warn()。代码如下。

if(!this.console){ // 用 this 代替 window 更通用，可在一些非浏览器的 js 环境中使用，例如 ASP in JScript
    this.console = {
        log : alert
    }
}
if(!console.dir){
    console.dir = console.log;
}

Object.create() 创建对象

不使用 new 创建对象，就应该使用 Object.create()。该方法最早由 D.C 提出，然后被纳入 ECMAScript 语言标准，这也是笔者所极力推荐的方法。

if (!Object.create){
    Object.create = function (o) {
        if (arguments.length > 1) {
            throw new Error('Object.create implementation only accepts the first parameter.');
        }
        function F() {}
        F.prototype = o;
        return new F();
    };
}

参见本博客系列文章《OO思想（js）》。

String.prototype.format()

无须多讲，这方法很常用。但奇怪的是，好像没有被纳入语言 API 的迹象。

String.prototype.format = function () {
    var str = this; 
    if(typeof(arguments[0]) == 'string'|| typeof(arguments[0]) == 'number'){
        for(var i = 0, j = arguments.length; i < j; i++){
            str = str.replace(new RegExp('\\{' + i +'\\}', 'g'), arguments[i]);
        }
    }else{
        for(var i in arguments[0]){
            str = str.replace(new RegExp('\\{' + i +'\\}', 'g'), arguments[0][i]); // 大小写敏感
        }
    }

    return str;
}

Date.prototype.format()

视各场合而用。

参见本博客文章《JavaScript自定义日期格式化函数》。

Function.prototype.bind() 函数作用域绑定

Function.prototype.bind 很实用。笔者的方案依赖于 delegate，除了指定作用域外还能指定函数的参数。

if(!Function.prototype.bind){
    Function.prototype.bind = function (scope) {
        this.scope = scope;
        return this.delegate();
    }
}

delegate 参见源码： http://naturaljs.googlecode.com/svn/trunk/src/dhtml/prototype.js。

参见本博客文章《我对 Javascript 原型的扩展函数》。

JSON 序列化

IE8+ 很及时地对 JSON 支持，这点很好。

if(!window.JSON)window.JSON = {
  // 加入 JSON 包
};

IE7或以下的必须依赖其他包

<!--[if lte IE 7]>
    <script src=""<%=bigfootUrl%>libs/json2.js"></script>
<![endif]-->

HTML/CSS 渲染问题

<!--[if lte IE 8]>
    <script src="<%=bigfootUrl%>libs/html5shim.js"></script>
<![endif]-->

DOM 控制

跨浏览器问题

// for IE8-
if(!window.addEventListener){
	/**
	 * @param {String} eventName 事件名称，不要带 on 开头
	 * @param {Function} eventHandler 事件处理器
	 */
	window.addEventListener = Element.prototype.addEventListener = function(eventName, eventHandler){
		this.attachEvent('on' + eventName, eventHandler);
	}
}

// for IE8-
if(!window.XMLHttpRequest); // see request.js

// for IE7- 不报错
if(!window.Element)window.Element = function(){};

/**
* 一般来讲我们不通过 style.xxx 来获取元素的样式。IE8 不支持，IE9开始支持。
* http://www.w3help.org/zh-cn/causes/BT9008
*/
if (!window.getComputedStyle) {
    window.getComputedStyle = function (el) {
    	return el.currentStyle;
    }
}

if(!window.postMessage){
	console.warn('不支持 postMessage');
	window.postMessage = function(event){
		var e = {
			data : event
		};
		render(e);
	}
}

样式列表

如浏览器不支持 el.classList 属性，设置一个，例如这样：

;(function(){
	var el = document.createElement('div');
	if(!el.classList){
		Element.prototype.classList = {

		};
	}
})();

参见本博客文章《浏览器已经支持 className 的一些方法了》。

data-* 属性

如浏览器不支持 HTML5 data-* 属性，也可以设置一个。但这种方法有入侵原生方法之嫌。

源码详见：https://code.google.com/p/naturaljs/source/browse/trunk/src/webview/patch.js

参见本博客文章《自动获取HTML5 的 data-* 属性》。

Android 2.x 不支持元素:active 的办法

参见本博客文章《记一次 JS 模拟 CSS active 效果的过程》。

源码详见：https://code.google.com/p/naturaljs/source/browse/trunk/src/webview/patch.js

DOM Ready 方法

这个方法事件是个事件。在早期的时候，DOMReady 很受用。但是笔者现在的习惯就是，先写 HTML 再写 Script，让这个顺序固定好，DOMReady 使用的机会就不多了。当然不好就是 Script 都写成一块一块的较分散，不能写在头部的 <head> 中。

/*
 * 注册浏览器的 DOMContentLoaded 事件，@todo 应有自我卸载的功能。
 * @param {Function} onready [必填]在DOMContentLoaded事件触发时需要执行的函数
 */
document.onReady = function(f){
	if(/in/.test(document.readyState)){
		window.setTimeout(arguments.callee, 9, f);
	}else{
		f();
	}
}

见过其他的实现，代码行数较多。这个就很短小，原理较巧妙（当然也要注意 document.readyState 浏览器是否支持），值得推荐。最后 f 是对 arguemnts.callee 的传参，应用到了 setTimeout/ setInterval 的新写法。同样这种新写法也有补丁。参见下面。

setTimeout/ setInterval 传参新写法

曾几何时，对 setTimeout/ setInterval 如何传递参数是童鞋们一大关心的问题。如果了解 JS 函数和事件队列，那么这个问题迎刃而解。不过，话又说回来，如果 API 直接提供传参功能，岂不是很好？恰恰就是这种想法，新版的浏览器提供了。要写旧补丁的话，可参见如下的。

/*\
|*|  IE-specific polyfill which enables the passage of arbitrary arguments to the
|*|  callback functions of javascript timers (HTML5 standard syntax).
|*|  https://developer.mozilla.org/en-US/docs/DOM/window.setInterval
|*|  Syntax:
|*|  var timeoutID = window.setTimeout(func, delay, [param1, param2, ...]);
|*|  var timeoutID = window.setTimeout(code, delay);
|*|  var intervalID = window.setInterval(func, delay[, param1, param2, ...]);
|*|  var intervalID = window.setInterval(code, delay);
\*/
;(function(){
	if (document.all && !window.setTimeout.isPolyfill) {
	  var __nativeST__ = window.setTimeout;
	  window.setTimeout = function (vCallback, nDelay /*, argumentToPass1, argumentToPass2, etc. */) {
	    var aArgs = Array.prototype.slice.call(arguments, 2);
	    return __nativeST__(vCallback instanceof Function ? function () {
	      vCallback.apply(null, aArgs);
	    } : vCallback, nDelay);
	  };
	  window.setTimeout.isPolyfill = true;
	}
	 
	if (document.all && !window.setInterval.isPolyfill) {
	  var __nativeSI__ = window.setInterval;
	  window.setInterval = function (vCallback, nDelay /*, argumentToPass1, argumentToPass2, etc. */) {
	    var aArgs = Array.prototype.slice.call(arguments, 2);
	    return __nativeSI__(vCallback instanceof Function ? function () {
	      vCallback.apply(null, aArgs);
	    } : vCallback, nDelay);
	  };
	  window.setInterval.isPolyfill = true;
	}
})();

附：《兼容的浏览器原生功能支持》http://goojs.com/polyfill.html

- 名称：
  ExplorerCanvas
- 描述：HTML5 canvas tag support for Internet Explorer.
- 大小：4.3k
- 链接：http://code.google.com/p/explorercanvas/
- 名称：
  Placeholder.js
- 描述：Adds support for the placeholder attribute in older browsers that don't support this HTML5 feature.
- 大小：0.4k
- 链接：https://github.com/NV/placeholder.js
- 名称：
  JSON2
- 描述：Creates a JSON property in the global object, if there isn't already one, with stringify and parse methods.
- 大小：1.3k
- 链接：https://github.com/douglascrockford/JSON-js
- 名称：
  yepnope
- 描述：yepnope is an asynchronous conditional resource loader that allows you to load only the scripts that your users need.
- 大小：1.6k
- 链接：http://yepnopejs.com/
- 名称：
  ES5-Shim
- 描述：Compatibility shims so that legacy JavaScript engines behave as closely as possible to ES5.
- 大小：2.0k
- 链接：https://github.com/kriskowal/es5-shim/
- 名称：
  H5F.js
- 描述：Adds support for HTML5 Forms chapters new field input types, attributes and constraint validation API in non-supporting browsers.
- 大小：1.8k
- 链接：https://github.com/ryanseddon/H5F
- 名称：
  Base64.js
- 描述：`window.btoa` and `window.atob` for browsers which don't provide these functions.
- 大小：0.9k
- 链接：https://bitbucket.org/davidchambers/base64.js
- 名称：
  Head JS
- 描述：An asynchronous loader library, with HTML5 and CSS3 polyfills
- 大小：2.8k
- 链接：http://headjs.com/
- 名称：
  Augment.js
- 描述：Enables use of modern JavaScript by augmenting built in objects with the latest JavaScript methods.
- 大小：1.4k
- 链接：http://augmentjs.com
- 名称：
  thumbs.js
- 描述：Add touch event support to the desktop and other mouse-based browsers.
- 大小：0.6k
- 链接：http://mwbrooks.github.com/thumbs.js/

提示用户升级 IE

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    </script>
    <script>
    // ie_patch
// for IE8 & IE8-
// 用 this 代替 window 更通用，可在一些非浏览器的 js 环境中使用，例如 ASP in JScript
// IE8 只有在 DevTools 被打开的情况下才可用
if(!this.console){ 
    this.console = {
        log : function(){}
    }
}
if(!console.dir){
    console.dir = console.log;
}

// 用 this 代替 window 更通用，可在一些非浏览器的 js 环境中使用，例如 ASP in JScript
// IE8 只有在 DevTools 被打开的情况下才可用
if(!this.console){ 
        this.console = {
                log : function(){}
        };
}

if(!console.dir){
        console.dir = console.log;
}
// IE 6 不支持，IE7开始支持。
// XMLHttpRequest

// IE8 不支持，IE9开始支持。
if (!Object.create){
    Object.create = function (o) {
        if (arguments.length > 1)throw new Error('Object.create implementation only accepts the first parameter.');
        
        function F() {}
        F.prototype = o;
        return new F();
    };
}



// IE8 不支持，IE9开始支持。
if(!String.prototype.trim) {
  String.prototype.trim = function () {
    return this.replace(/^\s+|\s+$/g,'');
  };
}

// IE8 不支持，IE9开始支持。
if(!Function.prototype.bind){
    Function.prototype.bind = function () {
        if (!arguments.length) return this;
        var _ = this, p = Array.prototype.slice.call(arguments), A = p.shift();
        return function () {
            return _.apply(A, p.concat(Array.prototype.slice.call(arguments)))
        }
    }
}

// IE8 不支持，IE9开始支持。
if(!Array.prototype.indexOf) {
    Array.prototype.indexOf = function(obj, start) {
         for (var i = (start || 0), j = this.length; i < j; i++) {
             if (this[i] === obj) { return i; }
         }
         return -1;
    }
}

/**
* 一般来讲我们不通过 style.xxx 来获取元素的样式。IE8 不支持，IE9开始支持。
* http://www.w3help.org/zh-cn/causes/BT9008
*/
if (!window.getComputedStyle) {
    window.getComputedStyle = function (el) {
        return el.currentStyle;
    }
}

function getChildren(){
        var children = [];
        for(var node, childNodes = this.childNodes, i = 0, j = childNodes.length; i < j; i++){
                // for ie8-
                node = childNodes[i];
                
                if(node.nodeType == 1)children.push(elWrapper(node));
        }
        
        return children;
}

//placeholder 占位符
if(window.navigator.isIE6 || window.navigator.isIE7 || window.navigator.isIE8 || window.navigator.isIE9){
        /*
         * Author: lichen , http://leechan.me
         * E-mail: chen.ican@gmail.com
         * Date  : 2012-07-27
         */
        ;(function(doc,win){
                if('placeholder' in doc.createElement('input')){
                        return;
                }
                var addEvent = function(obj, type, fn) {
                        if (obj.attachEvent) {
                                if(obj['e' + type + fn]){
                                        return;
                                }
                            obj['e' + type + fn] = fn;
                            obj[type + fn] = function(){
                                obj['e' + type + fn](win.event);
                            }
                            obj.attachEvent('on' + type, obj[type + fn]);
                        } else {
                                obj.addEventListener(type, fn, false);
                        }
                }
                         
                var placeHolderFix = function(){
                        var inputs = doc.getElementsByTagName('input'), textareas = doc.getElementsByTagName('textarea');

                        //input
                        for(var i = 0,len = inputs.length; i < len; i++){
                                var input = inputs[i], inputAttr = input.getAttribute('placeholder');
                                if(input.type !== 'password' && inputAttr){
                                        input.value = inputAttr;
                                        var focusHandler = (function(inputAttr){
                                                return function(){
                                                        if(this.value == inputAttr)this.value = "";
                                                }
                                        })(inputAttr);
                                        var blurHandler = (function(inputAttr){
                                                return function(){
                                                        if(this.value == "")this.value = inputAttr;
                                                }
                                        })(inputAttr);
                                        addEvent(input,'focus',focusHandler);
                                        addEvent(input,'blur',blurHandler);
                                }
                        }

                        //textarea
                        for(var i = 0,len = textareas.length; i < len; i++){
                                var textarea = textareas[i], textareaAttr = textarea.getAttribute('placeholder');
                                if(textareaAttr){
                                        textarea.innerText = textareaAttr;
                                        var focusHandler = (function(textareaAttr){
                                                return function(){
                                                        if(this.innerText == textareaAttr)this.innerText = "";
                                                }
                                        })(textareaAttr);
                                        var blurHandler = (function(textareaAttr){
                                                return function(){
                                                        if(this.innerText == "")this.innerText = textareaAttr;
                                                }
                                        })(textareaAttr);
                                        addEvent(textarea,'focus',focusHandler);
                                        addEvent(textarea,'blur',blurHandler);
                                }
                        }
                }
                addEvent(win,'load',placeHolderFix);
        })(document,window);
}
    </script>
<![endif]-->
<!--[if lte IE 7]>
    <script>
// ie7_patch
// PNG半透明图片的问题
if(/msie 6/.test(window.navigator.userAgent.toLowerCase())){
        function correctPNG(){
            var arVersion = navigator.appVersion.split("MSIE")
            var version = parseFloat(arVersion[1])
            if ((version >= 5.5) && (document.body.filters))
            {
               for(var j=0; j<document.images.length; j++)
               {
                  var img = document.images[j]
                  var imgName = img.src.toUpperCase()
                  if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
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                     var imgID = (img.id) ? "id='" + img.id + "' " : ""
                     var imgClass = (img.className) ? "class='" + img.className + "' " : ""
                     var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
                     var imgStyle = "display:inline-block;" + img.style.cssText
                     if (img.align == "left") imgStyle = "float:left;" + imgStyle
                     if (img.align == "right") imgStyle = "float:right;" + imgStyle
                     if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
                     var strNewHTML = "<span " + imgID + imgClass + imgTitle
                     + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
                     + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
                     + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"
                     img.outerHTML = strNewHTML
                     j = j-1
                  }
               }
            }    
        }
        window.attachEvent("onload", correctPNG);

        // IE6下默认不缓存背景图片
        try {
          document.execCommand('BackgroundImageCache', false, true);
        } catch(e) {}
}

if(!window.JSON)window.JSON = {};

// for IE7- 不报错
if(!window.Element)window.Element = function(){};

// for IE8-
if(!window.addEventListener){
        /**
         * @param {String} eventName 事件名称，不要带 on 开头
         * @param {Function} eventHandler 事件处理器
         */
        window.addEventListener = Element.prototype.addEventListener = function(eventType, funcHandle, useCapture) {
        var element = this;
        if (eventType == "input") { eventType = "propertychange"; }
        
        // 兼容处理
        var eventHandle = function(event) {
            event = event || window.event || {};
            
            if (!event.target) event.target = event.srcElement;        
            if (!event.preventDefault) event.preventDefault = function() {
                    event.returnValue = false;
            };
            
            if (eventType == "propertychange" && event.propertyName !== "value") return;
            
            return funcHandle.call(element, event);
        };
        eventHandle.initFuncHandle = funcHandle;
        

        element.attachEvent("on" + eventType, eventHandle);// event bind
        
        // event store
        if (element["event" + eventType])
                element["event" + eventType].push(eventHandle);
        else 
                element["event" + eventType] = [eventHandle];
    }
}

if(!window.postMessage){
        console.warn('不支持 postMessage');
        window.postMessage = function(event){
                var e = {
                        data : event
                };
                render(e);
        }
}

// for IE7- = addEventListener + MyUtils
if(!document.querySelector) {
        function fDomExtend(collection) {
        // collection extend some dom method
        for (var element, i = 0, len = collection.length; i < len; ++i){
                element = collection[i];

                        for (var key in oDomExtend)
                                element[key] = oDomExtend[key].bind(element);
                        for (var key in addElementMethod)
                                element[key] = addElementMethod[key].bind(element);
        }
        return collection;
    };

    document.querySelector = function(selector) {
        return document.querySelectorAll(selector)[0] || null;
    }
    document.querySelectorAll = function(selector) {
        if(!window.Sizzle)throw 'Sizzle.js 未加载！';
        var collection = Sizzle(selector);                
        return fDomExtend(collection);        
    }

        /**
     * dom method that extend
    */
    var oDomExtend = {
        // selector realtive
        querySelector: function(selector) {
            return oDomExtend.querySelectorAll.call(this, selector)[0] || null;
        },
        querySelectorAll: function(selector) {
            return fDomExtend(Sizzle(selector, this));
        },

        // addEventListener
        addEventListener : Element.prototype.addEventListener,
        on : Element.prototype.addEventListener
    };
}

var isNEED = window.navigator.isIE6 || window.navigator.isIE7;
window.elWrapper = function(el){
        if(!isNEED)return el;
        return fDomExtend([el])[0];
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    </script>
<![endif]-->
<!--[if lte IE 7]>
<style type="text/css">
	#popDiv {
		width:412px;
		background: #f0f0f6;
		border: 10px solid #e0e0e0;
		padding:0 0 10px 0;
		border-top:none;
		text-alig: left;
		font-size: 12px;
		z-index:99;
		left:50%;/*FF IE7*/
		top: 50%;/*FF IE7*/
		margin-left:-200px!important;/*FF IE7 该值为本身宽的一半 */
		margin-top:-60px!important;/*FF IE7 该值为本身高的一半*/
		margin-top:0px;
		position:fixed!important;/*FF IE7*/
		position:absolute;/*IE6*/
		_top:expression(eval(document.compatMode && document.compatMode=='CSS1Compat') ? documentElement.scrollTop + (document.documentElement.clientHeight-this.offsetHeight)/2 :/*IE6*/ document.body.scrollTop + (document.body.clientHeight - this.clientHeight)/2);/*IE5 IE5.5*/
	}
	#popDiv a{text-decoration:none;color:#f00;}
	#popDiv a:hover{color:#f60;}
	#isclose{position:absolute;bottom:5px;right:6px;}
	#isclose a{border:1px solid #e0e0e0;padding:2px 5px;background:#f0f0f6;}
	#isclose a:hover{color:#f60;background:#fc6;}
	#popDiv h1{font-size:12px;line-height:24px;background:#e0e0e0;line-height:30px;color:#333;}
	#popDiv h2{font-size:12px;text-indent:24px;line-height:24px;color:#333;font-weight:normal;padding:10px;}
	#popDiv p{line-height:24px;display:inline-block;text-indent:24px;}
</style>

<div id="popDiv">
	<h1>还在使用IE6/IE7的用户，建议升级到IE8:)</h1>
	<h2>您使用的是较低版本浏览器，将导致无法使用本系统的部分功能。我们建议您使用 IE8.0 或其他较新版本浏览器，以便更好的感受本系统的各项特色功能及服务，感谢您对本系统的关心和支持。</h2>
	</p>
	<br /><br />
	<p id="isclose">
		<a href="http://www.microsoft.com/zh-cn/download/internet-explorer-8-details.aspx" target="_blank">下载 IE 8</a>
		<a href="#" onclick="document.getElementById('popDiv').style.display='none';" id="acontinue">继续使用</a>
		<a href="javascript:window.close();" id="aClose">关闭窗口</a>
	</p>
</div>
<![endif]-->

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Function.prototype.bind() 函数作用域绑定

JSON 序列化

HTML/CSS 渲染问题

DOM 控制

跨浏览器问题

样式列表

data-* 属性

Android 2.x 不支持元素:active 的办法

DOM Ready 方法

setTimeout/ setInterval 传参新写法

ExplorerCanvas

Placeholder.js

JSON2

yepnope

ES5-Shim

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Base64.js

Head JS

Augment.js

thumbs.js

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