let user = [
    {
        id: 1,
        name: "小A",
    },
    {
        id: 2,
        name: "小B",
    },
    {
        id: 3,
        name: "小C",
    },
    {
        id: 4,
        name: "小D",
    },
];

["小A", "小B", "小C", "小D"]

let name = [];

for (let i = 0; i < user.length; i++) {
    name.push(user[i].name);
}

let name = [];

user.forEach((item) => {
    name.push(item.name);
});

let name = user.map((item) => {
    return item.name;
});

let name = Array.from(user, ({ name }) => name);