JS 中Json常用操作

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

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

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

4. 添加新的字段
   
// 方式1
json.sex = '女';
// 方式2
var id = 'id';
json[id] = '123';
console.log(json)

5. 判断字段是否存在
   
console.log(json.hasOwnProperty(id))

6. 删除字段
   
方式1
delete json.id;
console.log(json);
方式2
delete json[id];
console.log(json);

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

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


9. 删除array中的一项

   array.splice(1)

   完整代码示例：

   “`
   
   
   
   
   Title
   
   

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)

“`