解决Firefox下outerHTML不支持问题
代码很简单，如下：
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var pro = window.HTMLElement.prototype;pro.__defineGetter__("outerHTML", function(){var str = "<" + this.tagName;var a = this.attributes;for(var i = 0, len = a.length; i < len; i++){if(a[i].specified){str += " " + a[i].name + '="' + a[i].value + '"';}}if(!this.canHaveChildren){return str + " />";}return str + ">" + this.innerHTML + "</" + this.tagName + ">";});pro.__defineSetter__("outerHTML", function(s){var r = this.ownerDocument.createRange();r.setStartBefore(this);var df = r.createContextualFragment(s);this.parentNode.replaceChild(df, this);return s;});pro.__defineGetter__("canHaveChildren", function(){return !/^(area|base|basefont|col|frame|hr|img|br|input|isindex|link|meta|param)$/.test(this.tagName.toLowerCase());});?
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