javascript格式化json显示实例分析

{ 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; };