使用Javascript正则表达式来格式化XML内容
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"><HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""> <script type="text/javascript"> String.prototype.removeLineEnd = function() { return this.replace(/(<.+?\s+?)(?:\n\s*?(.+?=".*?"))/g,'$1 $2') } function formatXml(text) { //去掉多余的空格 text = '\n' + text.replace(/(<\w+)(\s.*?>)/g,function($0, name, props) { return name + ' ' + props.replace(/\s+(\w+=)/g," $1"); }).replace(/>\s*?</g,">\n<"); //把注释编码 text = text.replace(/\n/g,'\r').replace(/<!--(.+?)-->/g,function($0, text) { var ret = '<!--' + escape(text) + '-->'; //alert(ret); return ret; }).replace(/\r/g,'\n'); //调整格式 var rgx = /\n(<(([^\?]).+?)(?:\s|\s*?>|\s*?(\/)>)(?:.*?(?:(?:(\/)>)|(?:<(\/)\2>)))?)/mg; var nodeStack = []; var output = text.replace(rgx,function($0,all,name,isBegin,isCloseFull1,isCloseFull2 ,isFull1,isFull2){ var isClosed = (isCloseFull1 == '/') || (isCloseFull2 == '/' ) || (isFull1 == '/') || (isFull2 == '/'); //alert([all,isClosed].join('=')); var prefix = ''; if(isBegin == '!') { prefix = getPrefix(nodeStack.length); } else { if(isBegin != '/') { prefix = getPrefix(nodeStack.length); if(!isClosed) { nodeStack.push(name); } } else { nodeStack.pop(); prefix = getPrefix(nodeStack.length); } } var ret = '\n' + prefix + all; return ret; }); var prefixSpace = -1; var outputText = output.substring(1); //alert(outputText); //把注释还原并解码，调格式 outputText = outputText.replace(/\n/g,'\r').replace(/(\s*)<!--(.+?)-->/g,function($0, prefix, text) { //alert(['[',prefix,']=',prefix.length].join('')); if(prefix.charAt(0) == '\r') prefix = prefix.substring(1); text = unescape(text).replace(/\r/g,'\n'); var ret = '\n' + prefix + '<!--' + text.replace(/^\s*/mg, prefix ) + '-->'; //alert(ret); return ret; }); return outputText.replace(/\s+$/g,'').replace(/\r/g,'\r\n'); } function getPrefix(prefixIndex) { var span = ' '; var output = []; for(var i = 0 ; i < prefixIndex; ++i) { output.push(span); } return output.join(''); } function btnFormat_click() { var $ = document.getElementById; $('output').value = formatXml($('input').value); } </script> </HEAD> <BODY> <textarea id="input" style="width:100%;height:45%;"></textarea> <div style="margin:0px auto;"><input type="button" id="btnFormat" onclick="btnFormat_click()" value="格式化" style="width:50%;height:10%;"/></div> <textarea id="output" style="width:100%;height:45%;"></textarea> </BODY></HTML>?
转自：http://www.cnblogs.com/evlon/archive/2009/01/09/1372283.html