首先，准备新建一个js文件。以下是JSON2.js的内容，把内容拷到js文件中，以便调用：
复制代码 代码如下:
// Create a JSON object only if one does not already exist. We create the
// methods in a closure to avoid creating global variables.
if (!this.JSON2)
{
this.JSON2 = {};
}
(function () {
"use strict";
function f(n) {
// Format integers to have at least two digits.
return n < 10 ? '0' + n : n;
}
if (typeof Date.prototype.toJSON !== 'function') {
Date.prototype.toJSON = function (key) {
return isFinite(this.valueOf()) ?
this.getUTCFullYear() + '-' +
f(this.getUTCMonth() + 1) + '-' +
f(this.getUTCDate()) + 'T' +
f(this.getUTCHours()) + ':' +
f(this.getUTCMinutes()) + ':' +
f(this.getUTCSeconds()) + 'Z' : null;
};
String.prototype.toJSON =
Number.prototype.toJSON =
Boolean.prototype.toJSON = function (key) {
return this.valueOf();
};
}
var cx = /[u0000u00adu0600-u0604u070fu17b4u17b5u200c-u200fu2028-u202fu2060-u206fufeffufff0-uffff]/g,
escapable = /[\"x00-x1fx7f-x9fu00adu0600-u0604u070fu17b4u17b5u200c-u200fu2028-u202fu2060-u206fufeffufff0-uffff]/g,
gap,
indent,
meta = { // table of character substitutions
'b': '\b',
't': '\t',
'n': '\n',
'f': '\f',
'r': '\r',
'"' : '\"',
'\': '\\'
},
rep;
function quote(string) {
escapable.lastIndex = 0;
return escapable.test(string) ?
'"' + string.replace(escapable, function (a) {
var c = meta[a];
return typeof c === 'string' ? c :
'\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
}) + '"' :
'"' + string + '"';
}
function str(key, holder) {
var i, // The loop counter.
k, // The member key.
v, // The member value.
length,
mind = gap,
partial,
value = holder[key];
if (value && typeof value === 'object' &&
typeof value.toJSON === 'function') {
value = value.toJSON(key);
}
if (typeof rep === 'function') {
value = rep.call(holder, key, value);
}
switch (typeof value) {
case 'string':
return quote(value);
case 'number':
return isFinite(value) ? String(value) : 'null';
case 'boolean':
case 'null':
return String(value);
case 'object':
if (!value) {
return 'null';
}
gap += indent;
partial = [];
if (Object.prototype.toString.apply(value) === '[object Array]') {
length = value.length;
for (i = 0; i < length; i += 1) {
partial[i] = str(i, value) || 'null';
}
v = partial.length === 0 ? '[]' :
gap ? '[n' + gap +
partial.join(',n' + gap) + 'n' +
mind + ']' :
'[' + partial.join(',') + ']';
gap = mind;
return v;
}
if (rep && typeof rep === 'object') {
length = rep.length;
for (i = 0; i < length; i += 1) {
k = rep[i];
if (typeof k === 'string') {
v = str(k, value);
if (v) {
partial.push(quote(k) + (gap ? ': ' : ':') + v);
}
}
}
} else {
for (k in value) {
if (Object.hasOwnProperty.call(value, k)) {
v = str(k, value);
if (v) {
partial.push(quote(k) + (gap ? ': ' : ':') + v);
}
}
}
}
v = partial.length === 0 ? '{}' :
gap ? '{n' + gap + partial.join(',n' + gap) + 'n' +
mind + '}' : '{' + partial.join(',') + '}';
gap = mind;
return v;
}
}
if (typeof JSON2.stringify !== 'function') {
JSON2.stringify = function (value, replacer, space) {
var i;
gap = '';
indent = '';
if (typeof space === 'number') {
for (i = 0; i < space; i += 1) {
indent += ' ';
}
} else if (typeof space === 'string') {
indent = space;
}
rep = replacer;
if (replacer && typeof replacer !== 'function' &&
(typeof replacer !== 'object' ||
typeof replacer.length !== 'number')) {
throw new Error('JSON2.stringify');
}
return str('', {'': value});
};
}
if (typeof JSON2.parse !== 'function') {
JSON2.parse = function (text, reviver) {
var j;
function walk(holder, key) {
var k, v, value = holder[key];
if (value && typeof value === 'object') {
for (k in value) {
if (Object.hasOwnProperty.call(value, k)) {
v = walk(value, k);
if (v !== undefined) {
value[k] = v;
} else {
delete value[k];
}
}
}
}
return reviver.call(holder, key, value);
}
text = String(text);
cx.lastIndex = 0;
if (cx.test(text)) {
text = text.replace(cx, function (a) {
return '\u' +
('0000' + a.charCodeAt(0).toString(16)).slice(-4);
});
}
if (/^[],:{}s]*$/
.test(text.replace(/\(?:["\/bfnrt]|u[0-9a-fA-F]{4})/g, '@')
.replace(/"[^"\nr]*"|true|false|null|-?d+(?:.d*)?(?:[eE][+-]?d+)?/g, ']')
.replace(/(?:^|:|,)(?:s*[)+/g, ''))) {
j = eval('(' + text + ')');
return typeof reviver === 'function' ?
walk({'': j}, '') : j;
}
throw new SyntaxError('JSON2.parse');
};
}
}());
第二、调用页的内容
注意：调用js文件的路径需要自己调整，这点如果不会，那就别再继续看了。
复制代码 代码如下:
var a = '{ "name": "tom", "sex": "男", "age": "24" }'; // 用于组成json的字符串;
alert("用于组成json的字符串:【"+a+"】");
var b = JSON2.parse(a); // 把字符串a转换为json格式b
var c = JSON2.stringify(a); //把json格式b转换为字符串c
alert("转换后的字符串：【"+c+"】");
