JS 中Json常用操作

时间：2024-08-26 12:35:14

转自：

https://www.jianshu.com/p/6501b0f3124f

  1. 直接定义json
   var json = {"name": "小明", "age": 12};

   console.log(json);
  1. json 转 String
    var str = JSON.stringify(json);

   console.log(str);
  1. String 转 Json
json = JSON.parse(str);

console.log(json)
  1. 添加新的字段
  // 方式1

   json.sex = '女';

  // 方式2

   var id = 'id';

   json[id] = '123';

   console.log(json)
  1. 判断字段是否存在
console.log(json.hasOwnProperty(id))
  1. 删除字段
方式1

delete json.id;

console.log(json);

方式2

delete json[id];

console.log(json);
  1. 添加JsonArray
var array = [{"name": "小李", "age": 20}];

console.log(array);

array.push(json);

console.log(array);
  1. 遍历JsonArray
for (var item in array) {

       console.log(array[item].name)

   }
  1. 删除array中的一项
 array.splice(1)

完整代码示例：

<!DOCTYPE html>

<html lang="en">

<head>

   <meta charset="UTF-8">

   <title>Title</title>

</head>

<body>

<script type="text/javascript">

   var json = {"name": "小明", "age": 12};

   console.log(json);

   var str = JSON.stringify(json);

   console.log(str);

   json.sex = '女';

   var id = 'id';

   json[id] = '123';

   console.log(json)

   console.log(json.hasOwnProperty(id))

   delete json.id;

   console.log(json);

   id = 'id';

   json[id] = '123';

   console.log(json);

   delete json[id];

   console.log(json);

   var array = [{"name": "小李", "age": 20}];

   console.log(array);

   array.push(json);

   console.log(array);

   for (var item in array) {

       console.log(array[item].name)

   }

   array.splice(1)

   console.log(array)

</script>

</body>

</html>

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