JSON格式化 JSON美化 输出到html

{"promotion_details":{"promotion_detail":[{"discount_fee":"22.20","id":1308028810791231,"promotion_desc":"促销价:省22.20元","promotion_id":"Tmall$tmallItemPromotion_WIRELESS-62575129_546359362","promotion_name":"促销价"}]},"trade_from":"WAP,WAP"}

将上面json格式化在html输出

{
 "promotion_details":{
        "promotion_detail":[
            {
                "discount_fee":"22.20",
                "id":1308028810791231,
                "promotion_desc":"促销价:省22.20元",
                "promotion_id":"Tmall$tmallItemPromotion_WIRELESS-62575129_546359362",
                "promotion_name":"促销价"
            }
        ]
    },
    "trade_from":"WAP,WAP"
 }

项目中需要再html页面显示json串,于是找了些方法;

原文参见:

第一种函数:http://www.huqiwen.com/2013/01/07/share-format-json-code/

第二种函数:http://www.sharejs.com/codes/javascript/5452

方法1效果较好,以上面json为例,第二个函数会将"trade_from":"WAP,WAP"  从 逗号 处隔开.有一点问题

方法1正常

方法1:

/**
 * json美化
 *   jsonFormat2(json)这样为格式化代码。
 *   jsonFormat2(json,true)为开启压缩模式
 * @param txt
 * @param compress
 * @returns {string}
 */
function jsonFormat(txt,compress){
    var indentChar = '    ';
    if(/^s*$/.test(txt)){
        alert('数据为空,无法格式化! ');
        return;
    }
    try{var data=eval('('+txt+')');}
    catch(e){
        alert('数据源语法错误,格式化失败! 错误信息: '+e.description,'err');
        return;
    };
    var draw=[],last=false,This=this,line=compress?'':'
',nodeCount=0,maxDepth=0;

    var notify=function(name,value,isLast,indent/*缩进*/,formObj){
        nodeCount++;/*节点计数*/
        for (var i=0,tab='';i<indent;i++ )tab+=indentChar;/* 缩进HTML */
        tab=compress?'':tab;/*压缩模式忽略缩进*/
        maxDepth=++indent;/*缩进递增并记录*/
        if(value&&value.constructor==Array){/*处理数组*/
            draw.push(tab+(formObj?('"'+name+'":'):'')+'['+line);/*缩进'[' 然后换行*/
            for (var i=0;i<value.length;i++)
                notify(i,value[i],i==value.length-1,indent,false);
            draw.push(tab+']'+(isLast?line:(','+line)));/*缩进']'换行,若非尾元素则添加逗号*/
        }else   if(value&&typeof value=='object'){/*处理对象*/
            draw.push(tab+(formObj?('"'+name+'":'):'')+'{'+line);/*缩进'{' 然后换行*/
            var len=0,i=0;
            for(var key in value)len++;
            for(var key in value)notify(key,value[key],++i==len,indent,true);
            draw.push(tab+'}'+(isLast?line:(','+line)));/*缩进'}'换行,若非尾元素则添加逗号*/
        }else{
            if(typeof value=='string')value='"'+value+'"';
            draw.push(tab+(formObj?('"'+name+'":'):'')+value+(isLast?'':',')+line);
        };
    };
    var isLast=true,indent=0;
    notify('',data,isLast,indent,false);
    return draw.join('');
}

方法2:

/**
 * json格式化便于美观在html页面输出
 * @param json
 * @param options
 * @returns {string}
 */
function jsonFormat(json, options) {

    var reg = null,
        formatted = '',
        pad = 0,
        PADDING = '    '; // one can also use '	' or a different number of spaces

    // optional settings
    options = options || {};
    // remove newline where '{' or '[' follows ':'
    options.newlineAfterColonIfBeforeBraceOrBracket = (options.newlineAfterColonIfBeforeBraceOrBracket === true) ? true : false;
    // use a space after a colon
    options.spaceAfterColon = (options.spaceAfterColon === false) ? false : true;

    // begin formatting...
    if (typeof json !== 'string') {
        // make sure we start with the JSON as a string
        json = JSON.stringify(json);
    } else {
        // is already a string, so parse and re-stringify in order to remove extra whitespace
        json = JSON.parse(json);
        json = JSON.stringify(json);
    }

    // add newline before and after curly braces
    reg = /([{}])/g;
    json = json.replace(reg, '
$1
');

    // add newline before and after square brackets
    reg = /([[]])/g;
    json = json.replace(reg, '
$1
');

    // add newline after comma
    reg = /(\,)/g;
    json = json.replace(reg, '$1
');

    // remove multiple newlines
    reg = /(

)/g;
    json = json.replace(reg, '
');

    // remove newlines before commas
    reg = /
\,/g;
    json = json.replace(reg, ',');

    // optional formatting...
    if (!options.newlineAfterColonIfBeforeBraceOrBracket) {
        reg = /:
{/g;
        json = json.replace(reg, ':{');
        reg = /:
[/g;
        json = json.replace(reg, ':[');
    }
    if (options.spaceAfterColon) {
        reg = /:/g;
        json = json.replace(reg, ': ');
    }

    $.each(json.split('
'), function(index, node) {
        var i = 0,
            indent = 0,
            padding = '';

        if (node.match(/{$/) || node.match(/[$/)) {
            indent = 1;
        } else if (node.match(/}/) || node.match(/]/)) {
            if (pad !== 0) {
                pad -= 1;
            }
        } else {
            indent = 0;
        }

        for (i = 0; i < pad; i++) {
            padding += PADDING;
        }

        formatted += padding + node + '
';
        pad += indent;
    });

    return formatted;
}

注意,调用函数返回结果后,加上<pre></pre>实现格式化输出