工作中遇到需要前端通过javascript对后端返回的json或者xml进行格式化处理的问题，特此记录下来，仅供交流

1.对json字符串进行格式化处理：

var jsonObj = JSON.parse(后端返回的json字符串);
var result = JSON.stringify(jsonObj, null, 2);//格式化

2.对xml字符串进行格式化处理：

1)、定义格式化方法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) + '-->';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 == '/');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);//把注释还原并解码，调格式outputText = outputText.replace(/\n/g,'\r').replace(/(\s*)<!--(.+?)-->/g,function($0, prefix,  text){if(prefix.charAt(0) == '\r')  prefix = prefix.substring(1);text = unescape(text).replace(/\r/g,'\n');var ret = '\n' + prefix + '<!--' + text.replace(/^\s*/mg, prefix ) + '-->';return ret;});return outputText.replace(/\s+$/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('');
}2)、调用方法进行格式化
var result = formatXml(后端返回的xml字符串);