js遍历list object

let list = [1, 2, 3, 4, 5];
for (let i = 0; i < list.length; i++) {
    console.log(list[i]);
}

let list = [1, 2, 3, 4, 5];
list.forEach(function(item) {
    console.log(item);
});

let list = [1, 2, 3, 4, 5];
for (let item of list) {
    console.log(item);
}

let list = [1, 2, 3, 4, 5];
let newList = list.map(function(item) {
    return item * 2;
});
console.log(newList); // [2, 4, 6, 8, 10]

let obj = { a: 1, b: 2, c: 3 };
for (let key in obj) {
    console.log(key + ': ' + obj[key]);
}

let obj = { a: 1, b: 2, c: 3 };
Object.keys(obj).forEach(function(key) {
    console.log(key + ': ' + obj[key]);
});

let list = [1, 2, 3, 4, 5];
let promises = list.map(async function(item) {
    let result = await someAsyncFunction(item);
    return result;
});
Promise.all(promises).then(function(results) {
    console.log(results);
});