javascript格式化json显示实例分析

本文实例讲述了javascript格式化json显示方法。分享给大家供大家参考。具体分析如下：

将json对象或者json字符串格式化方便在网页上限制

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, 'rn$1rn');
 // add newline before and after square brackets
 reg = /([[]])/g;
 json = json.replace(reg, 'rn$1rn');
 // add newline after comma
 reg = /(,)/g;
 json = json.replace(reg, '$1rn');
 // remove multiple newlines
 reg = /(rnrn)/g;
 json = json.replace(reg, 'rn');
 // remove newlines before commas
 reg = /rn,/g;
 json = json.replace(reg, ',');
 // optional formatting...
 if (!options.newlineAftercolonIfBeforeBraceOrBracket) { 
 reg = /:rn{/g;
 json = json.replace(reg, ':{');
 reg = /:rn[/g;
 json = json.replace(reg, ':[');
 }
 if (options.spaceAftercolon) {  
 reg = /:/g;
 json = json.replace(reg, ': ');
 }
 $.each(json.split('rn'), function(index, node) {
 var i = 0,
  indent = 0,
  padding = '';
 if (node.match(/{$/) || 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 + 'rn';
 pad += indent;
 });
 return formatted;
};

关于json格式化感兴趣的朋友还可参考在线工具：

JSON代码工具

希望本文所述对大家的javascript程序设计有所帮助。