JavaScript中JSON的解析与序列化

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stringify()

把JavaScript对象序列化为JSON字符串

var book = {    title: "Professional JavaScript",    authors: [        "Nicholas C. Zakas"    ],    edition: 3,    year: 2011}var jsonText = JSON.stringify(book);

stringify()中可传三个参数：需要序列化的JavaScript对象、过滤器(数组/函数)、指定字符串缩进方式。

过滤结果

若为数组：var book = {        "title":"Professional JavaScript",        "authors:" [            "Nicholas C. Zakas"        ],        edition: 3,        year: 2011};var jsonText = JSON.stringify(book,["title", "edition"]);那么jsonText就为：{"title":"Professional JavaScript","edition":3}若为函数：var jsonText = JSON.stringify(book, function(key,value)){    switch(key){        case "authors":            return value.join(",")        case "year":            return 5000;        case "edition":            return undefined;        default:            return value;    }}

字符串缩进

要在每个级别缩进4个空格var jsonText = JSON.stringify(book,null,4);将缩进字符改为短划线之类的任意字符：var jsonText = JSON.stringify(book,null,"- -")；

toJSON方法

直接在JavaScript对象中添加toJSON方法var book = {        "title":"Professional JavaScript",        "authors:" [            "Nicholas C. Zakas"        ],        edition: 3,        year: 2011，        toJSON:function(){            return this.title;        }};var jsonText = JSON.stringify(book);

parse()

把JSON字符串解析为原生JavaScript值。
```
var bookCopy = JSON.parse(jsonText);
```

JSON.parse()方法也可以接收另一个参数，该参数是一个函数，将在每个键值对儿上调用。

var book = {            "title":"Professional JavaScript",            "authors:" [                "Nicholas C. Zakas"            ],            edition: 3,            year: 2011，            releaseDate: new Date(2011, 11, 1)    };var jsonText = JSON.stringify(book);var bookCopy = JSON.parse(jsonText, function(key,value)){    if (key == "releaseDate"){        return new Date(value);    }else {        return value;    }}

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