JSON是一種基于文本的輕量級數據交換格式，因其簡單易讀、易于解析、可跨平臺、可嵌套使用而備受開發者喜愛，本文將會介紹JSON的增刪改查操作。

1. JSON增加

var data = {
"name": "Tom",
"age": 18,
"sex": "male"
};
// 往JSON對象里添加一個key-value
data.city = "Beijing";
// 在一個數組里添加一個JSON對象
data.students.push({ name: "Lucy", age: 20, sex: "female" });

2.JSON 刪除

var data = {
"name": "Tom",
"age": 18,
"sex": "male",
"city": "Beijing",
"students": [
{ "name": "Lucy", age: 20, sex: "female" },
{ "name": "Jack", age: 19, sex: "male" }
]
};
// 刪除一個key-value
delete data.city;
// 刪除一個JSON對象
data.students.splice(0, 1);

3. JSON 修改

var data = {
"name": "Tom",
"age": 18,
"sex": "male",
"city": "Beijing",
"students": [
{ "name": "Lucy", age: 20, sex: "female" },
{ "name": "Jack", age: 19, sex: "male" }
]
};
// 修改一個key-value
data.city = "Shanghai";
// 修改一個JSON對象
data.students[0].sex = "male";

4. JSON 查詢

var data = {
"name": "Tom",
"age": 18,
"sex": "male",
"city": "Beijing",
"students": [
{ "name": "Lucy", age: 20, sex: "female" },
{ "name": "Jack", age: 19, sex: "male" }
]
};
// 查詢一個key-value
console.log(data.city);
// 查詢一個JSON對象
console.log(data.students[0].age);

綜上所述，JSON的增刪改查操作非常簡單易用，為我們的開發工作提供了很大的便利。