10 个实用的 JS 技巧

var argArray = Array.prototype.slice.call(arguments);

var numbers = [3, 5, 7, 2];var sum = numbers.reduce((x, y) => x + y);console.log(sum); // returns 17

if (hungry) {    goToFridge();}

hungry && goToFridge()

function doSomething(arg1){    arg1 = arg1 || 32; // if it's not already set, arg1 will have 32 as a default value}

let x = 1;x = (x++, x);console.log(x);// expected output: 2x = (2, 3);console.log(x);// expected output: 3

var array = [11, 12, 13, 14, 15];console.log(array.length); // 5array.length = 3;console.log(array.length); // 3console.log(array); // [11,12,13]array.length = 0;console.log(array.length); // 0console.log(array); // []

let a = 1, b = 2[a, b] = [b, a]console.log(a) // -> 2console.log(b) // -> 1

var list = [1, 2, 3, 4, 5, 6, 7, 8, 9];console.log(list.sort(function() {    return Math.random() - 0.5}));// [4, 8, 2, 9, 1, 3, 6, 5, 7]

const dynamic = 'color';var item = {    brand: 'Ford',    [dynamic]: 'Blue'}console.log(item);// { brand: "Ford", color: "Blue" }

const my_array = [1, 2, 2, 3, 3, 4, 5, 5]const unique_array = [...new Set(my_array)];console.log(unique_array); // [1, 2, 3, 4, 5]