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js对JSON数组的增删改查
2022-07-06 15:41:00 【~疆】
目录
查询记录。根据username查询记录
const users = [
{ username: "张三", password: 333 },
{ username: "李四", password: 444 },
{ username: "王五", password: 555 },
];
//查询记录。根据username查询记录
let data = users.filter((item) => item.username == "张三");
console.log("根据username查询出的记录:", data);
删除记录。根据username删除记录
const users = [
{ username: "张三", password: 333 },
{ username: "李四", password: 444 },
{ username: "王五", password: 555 },
];
//删除记录。根据username删除记录
let data = users.filter((item) => item.username == "张三");
console.log("根据username查询出的记录:", data);
let index = users.indexOf(data[0]);
console.log("索引index:", index);
index !== -1 && users.splice(index, 1);
console.log("删除一条记录后的users:", users);
修改记录。根据username修改password
const users = [
{ username: "张三", password: 333 },
{ username: "李四", password: 444 },
{ username: "王五", password: 555 },
];
//修改记录。根据username修改password
let data = users.filter((item) => item.username == "张三");
console.log("根据username查询出的记录:", data);
data[0].password = 3333;
console.log("修改一条记录后的users:", users);
新增记录。
const users = [
{ username: "张三", password: 333 },
{ username: "李四", password: 444 },
{ username: "王五", password: 555 },
];
//新增记录。
users.push({ username: "赵六", password: 666 });
console.log("新增一条记录后的users:", users);
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