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>