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, '\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;
};

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。