json

JSON 语法规则

• 数据在名称/值对中
• 数据由逗号分隔
• 花括号保存对象
• 方括号保存数组

  • 数字（整数或浮点数）
  • 字符串（在双引号中）
  • 逻辑值（true 或 false）
  • 数组（在方括号中）
  • 对象（在花括号中）
  • null

JSON 格式示例

1.

{"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":"sciencefiction"},

{"firstName":"Tad","lastName":"Williams","genre":"fantasy"},

{"firstName":"Frank","lastName":"Peretti","genre":"christianfiction"}

],

"musicians":[

{"firstName":"Eric","lastName":"Clapton","instrument":"guitar"},

{"firstName":"Sergei","lastName":"Rachmaninoff","instrument":"piano"}

]}
2.如果在编译器的时候需要换行
var p1='{"player":[{"firstname":"koby","lastname":"bryant"},'+
    '{"firstname":"james","lastname":"hardon"}, {"firstname":"shuhao","lastname":"lin"}]}';


此时需要运用“+”和单引号连接两个分开的数据。

JSON 转为JS对象

 var obj=JSON.parse(p1);

运用内置函数JSON.parse

格式应用

运用点号

例如：obj.player[1].firstname