JS 中Json常用操作

转自：

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

直接定义json

   var json = {"name": "小明", "age": 12};
   console.log(json);

json 转 String

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

String 转 Json

json = JSON.parse(str);
console.log(json)

添加新的字段

  // 方式1
   json.sex = '女';
  // 方式2
   var id = 'id';
   json[id] = '123';
   console.log(json)

判断字段是否存在

console.log(json.hasOwnProperty(id))

删除字段

方式1
delete json.id;
console.log(json);
方式2
delete json[id];
console.log(json);

添加JsonArray

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

遍历JsonArray

for (var item in array) {
       console.log(array[item].name)
   }

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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