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/**
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* 格式化json字符串.
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* alert(formatJson('{"code":"0","data":[{"goods_name":"iPhoneX","id":1,"price":8000},{"goods_name":"三星","id":2,"price":7000}]}'))
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* @param txt json串
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* @param compress
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* @returns
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*/
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function formatJson(txt,compress/*是否为压缩模式*/){/* 格式化JSON源码(对象转换为JSON文本) */
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var indentChar = ' ';
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if(/^\s*$/.test(txt)){
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return '';
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}
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try{var data=eval('('+txt+')');}
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catch(e){
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console.error('json格式错误，无法格式化，格式化内容：' + txt);
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return txt;
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};
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var draw=[],last=false,This=this,line=compress?'':'\n',nodeCount=0,maxDepth=0;
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var notify=function(name,value,isLast,indent/*缩进*/,formObj){
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nodeCount++;/*节点计数*/
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for (var i=0,tab='';i<indent;i++ )tab+=indentChar;/* 缩进HTML */
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tab=compress?'':tab;/*压缩模式忽略缩进*/
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maxDepth=++indent;/*缩进递增并记录*/
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if(value&&value.constructor==Array){/*处理数组*/
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draw.push(tab+(formObj?('"'+name+'":'):'')+'['+line);/*缩进'[' 然后换行*/
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for (var i=0;i<value.length;i++)
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notify(i,value[i],i==value.length-1,indent,false);
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draw.push(tab+']'+(isLast?line:(','+line)));/*缩进']'换行,若非尾元素则添加逗号*/
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}else if(value&&typeof value=='object'){/*处理对象*/
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draw.push(tab+(formObj?('"'+name+'":'):'')+'{'+line);/*缩进'{' 然后换行*/
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var len=0,i=0;
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for(var key in value)len++;
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for(var key in value)notify(key,value[key],++i==len,indent,true);
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draw.push(tab+'}'+(isLast?line:(','+line)));/*缩进'}'换行,若非尾元素则添加逗号*/
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}else{
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if(typeof value=='string')value='"'+value+'"';
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draw.push(tab+(formObj?('"'+name+'":'):'')+value+(isLast?'':',')+line);
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};
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};
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var isLast=true,indent=0;
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notify('',data,isLast,indent,false);
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return draw.join('');
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}
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