JSON

2019-11-06 09:02:59

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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

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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