前端：xml格式化

//格式化xml代碼
    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<");
        //處理註釋
        text = text.replace(/\n/g,'\r').replace(/<!--(.+?)-->/g,function($0, text){
            var ret = '<!--' + escape(text) + '-->';
            return ret;
        }).replace(/\r/g,'\n');
        //調整格式  以壓棧方式遞歸調整縮進
        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 == '!'){//!開頭
                prefix = setPrefix(nodeStack.length);
            }else {
                if(isBegin != '/'){///開頭
                    prefix = setPrefix(nodeStack.length);
                    if(!isClosed){//非關閉標籤
                        nodeStack.push(name);
                    }
                }else{
                    nodeStack.pop();//彈棧
                    prefix = setPrefix(nodeStack.length);
                }
            }
            var ret =  '\n' + prefix + all;
            return ret;
        });
        var prefixSpace = -1;
        var outputText = output.substring(1);
        //還原註釋內容
        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;
    }
     
    //計算頭函數 用來縮進
    function setPrefix(prefixIndex) {
        var result = '';
        var span = '    ';//縮進長度
        var output = [];
        for(var i = 0 ; i < prefixIndex; ++i){
            output.push(span);
        }
        result = output.join('');
        return result;
    }