json对象和json字符串之间的转化

  1. json字符串—–>json对象
    a、使用JSON.parse()函数
    var jsonStr = '{"name":"zhangsan","age":23,"email":"chentging@aliyun.com"}';
    var json = JSON.parse(jsonStr); console.log(json);
    //输出:Object {name: "zhangsan", age: 23, email: "chentging@aliyun.com"}
    b、使用eval()函数
    var jsonStr = '{"name":"zhangsan","age":23,"email":"chentging@aliyun.com"}';
    var json = eval ("(" + jsonStr + ")"); console.log(json);
    //输出:Object {name: "zhangsan", age: 23, email: "chentging@aliyun.com"}
    c、使用jQuery插件jQuery.parseJSON()
    var jsonStr = '{"name":"zhangsan","age":23,"email":"chentging@aliyun.com"}';
    var json = jQuery.parseJSON(jsonStr); console.log(json);
    //输出:Object {name: "zhangsan", age: 23, email: "chentging@aliyun.com"}
  2. json对象——>json字符串
    • 使用JSON.stringify()
      var json = {name: "zhangsan", age: 23, email: "chentging@aliyun.com"};
      var jsonStr = JSON.stringify(json); console.log(jsonStr);
      //输出:"{"name":"zhangsan","age":23,"email":"chentging@aliyun.com"}"
    • 把数据在前后端之间传递，需要把json对象转换为json字符串