javascript格式化json显示

var formatJson = function(json, options) {    var reg = null,        formatted = '',        pad = 0,        PADDING = '    '; // one can also use '\t' 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, '\r\n$1\r\n');    // add newline before and after square brackets    reg = /([\[\]])/g;    json = json.replace(reg, '\r\n$1\r\n');    // add newline after comma    reg = /(\,)/g;    json = json.replace(reg, '$1\r\n');    // remove multiple newlines    reg = /(\r\n\r\n)/g;    json = json.replace(reg, '\r\n');    // remove newlines before commas    reg = /\r\n\,/g;    json = json.replace(reg, ',');    // optional formatting...    if (!options.newlineAfterColonIfBeforeBraceOrBracket) {                 reg = /\:\r\n\{/g;        json = json.replace(reg, ':{');        reg = /\:\r\n\[/g;        json = json.replace(reg, ':[');    }    if (options.spaceAfterColon) {                  reg = /\:/g;        json = json.replace(reg, ': ');    }    $.each(json.split('\r\n'), function(index, node) {        var i = 0,            indent = 0,            padding = '';        if (node.match(/\{$/) || 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 + '\r\n';        pad += indent;    });    return formatted;};

原文地址：http://www.sharejs.com/codes/javascript/5452