JSON

来源：互联网发布：js日期格式化yyyymmdd 编辑：程序博客网时间：2024/06/06 03:18

一、json数据格式

//第一种  名称/值对{ "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" } //第二种  数组    { "people": [    { "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },    { "firstName": "Jason", "lastName":"Hunter", "email": "bbbb"},    { "firstName": "Elliotte", "lastName":"Harold", "email": "cccc" }    ]}

将json数据赋值给变量

    var people = { "programmers": [ { "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },    { "firstName": "Jason", "lastName":"Hunter", "email": "bbbb" },    { "firstName": "Elliotte", "lastName":"Harold", "email": "cccc" }    ],    "authors": [    { "firstName": "Isaac", "lastName": "Asimov", "genre": "science fiction" },    { "firstName": "Tad", "lastName": "Williams", "genre": "fantasy" },    { "firstName": "Frank", "lastName": "Peretti", "genre": "christian fiction" }    ],    "musicians": [    { "firstName": "Eric", "lastName": "Clapton", "instrument": "guitar" },    { "firstName": "Sergei", "lastName": "Rachmaninoff", "instrument": "piano" }    ] }

访问数组

    people.authors[1].genre // Value is "fantasy"    people.musicians[3].lastName // Undefined. This refers to the fourth entry, and there isn't one    people.programmers[2].firstName // Value is "Elliotte"

修改json

    people.musicians[1].lastName = "Rachmaninov";    在将字符串转换为 JavaScript 对象之后，就可以像这样修改变量中的数据。

转换回json字符串

    在 JavaScript 中转换：    String newJSONtext = people.toJSONString();

二、json数组数据的解析

var value1 = [{"c01":"1","c02":"2","c03":"3","c04":"4","c05":"5","c06":"6","c07":"7","c08":"8","c09":"9"}, {"c01":"2","c02":"4","c03":"5","c04":"2","c05":"8","c06":"11","c07":"21","c08":"1","c09":"12"}, {"c01":"5","c02":"1","c03":"4","c04":"11","c05":"9","c06":"8","c07":"1","c08":"8","c09":"2"}];var obj1 = eval(value1);alert(obj1[0].c01);

三、 JSON.parse()和JSON.stringify()

1.parse 用于从一个字符串中解析出json 对象。例如

var str='{"name":"cpf","age":"23"}'经 JSON.parse(str) 得到：Object: age:"23"            name:"cpf"            _proto_:Object

ps:单引号写在{}外，每个属性都必须双引号，否则会抛出异常

2.stringify用于从一个对象解析出字符串，例如

var a={a:1,b:2}经 JSON.stringify(a)得到："{"a":1,"b":2}"

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