//格式化xml代码

	function formateXml(xmlStr){

		text = xmlStr;

		//使用replace去空格

        text = '\n' + text.replace(/(<\w+)(\s.*?>)/g,function($0, name, props){

            return name + ' ' + props.replace(/\s+(\w+=)/g," $1");

        }).replace(/>\s*?</g,">\n<");

        //处理注释

        text = text.replace(/\n/g,'\r').replace(/<!--(.+?)-->/g,function($0, text){

            var ret = '<!--' + escape(text) + '-->';

            return ret;

        }).replace(/\r/g,'\n');

        //调整格式	以压栈方式递归调整缩进

        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 == '/');

            var prefix = '';

            if(isBegin == '!'){//!开头

                prefix = setPrefix(nodeStack.length);

            }else {

                if(isBegin != '/'){///开头

                    prefix = setPrefix(nodeStack.length);

                    if(!isClosed){//非关闭标签

                        nodeStack.push(name);

                    }

                }else{

                    nodeStack.pop();//弹栈

                    prefix = setPrefix(nodeStack.length);

                }

            }

            var ret =  '\n' + prefix + all;

            return ret;

        });

        var prefixSpace = -1;

        var outputText = output.substring(1);

        //还原注释内容

        outputText = outputText.replace(/\n/g,'\r').replace(/(\s*)<!--(.+?)-->/g,function($0, prefix,  text){

            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 ) + '-->';

            return ret;

        });

		outputText=	outputText.replace(/\s+$/g,'').replace(/\r/g,'\r\n');

		return outputText;

    }

	//计算头函数	用来缩进

	function setPrefix(prefixIndex) {

		var result = '';

        var span = '    ';//缩进长度

        var output = [];

        for(var i = 0 ; i < prefixIndex; ++i){

            output.push(span);

        }

        result = output.join('');

        return result;

    }