一个很有用的Prototype扩展---outerHTML方法
if(typeof(HTMLElement)!="undefined" && !window.opera) { HTMLElement.prototype.__defineGetter__("outerHTML",function() { var a=this.attributes, str="<"+this.tagName, i=0;for(;i<a.length;i++) if(a.specified) str+=" "+a.name+'="'+a.value+'"'; if(!this.canHaveChildren) return str+" />"; return str+">"+this.innerHTML+"</"+this.tagName+">"; }); HTMLElement.prototype.__defineSetter__("outerHTML",function(s) { var r = this.ownerDocument.createRange(); r.setStartBefore(this); var df = r.createContextualFragment(s); this.parentNode.replaceChild(df, this); return s; }); HTMLElement.prototype.__defineGetter__("canHaveChildren",function() { return !/^(area|base|basefont|col|frame|hr|img|br|input|isindex|link|meta|param)$/.test(this.tagName.toLowerCase()); }); }使用方法：
<div id="test"> <input type="text" name="text" /> <p>this is a sentence</p></div><script>var out = document.getElementById("test").outerHTML;</script>
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