使用js函数格式化xml字符串带缩进

遇到了一个做soap的API的操作,中途需要说明xml的组装模式等,

如上图,组装产生的mxl代码药格式化并展示.由于是在前端做的,所以需要将字符串将xml进行格式化并输出,找到别人写的算法稍加更改并整理如下:

//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;
    }

　　

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