9 个极其强大的 JavaScript 技巧

var example = "potato potato";console.log(example.replace(/pot/, "tom")); // "tomato potato"console.log(example.replace(/pot/g, "tom")); // "tomato tomato"

var entries = [1, 2, 2, 3, 4, 5, 6, 6, 7, 7, 8, 4, 2, 1]var unique_entries = [...new Set(entries)];console.log(unique_entries);// [1, 2, 3, 4, 5, 6, 7, 8]

var converted_number = 5 + "";console.log(converted_number);// 5console.log(typeof converted_number); // string

the_string = "123";console.log(+the_string);// 123the_string = "hello";console.log(+the_string);// NaN

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

var entries = [1, [2, 5], [6, 7], 9];var flat_entries = [].concat(...entries); // [1, 2, 5, 6, 7, 9]

if (available) {    addToCart();}

available && addToCart()

const dynamic = 'flavour';var item = {    name: 'Coke',    [dynamic]: 'Cherry'}console.log(item); // { name: "Coke", flavour: "Cherry" }

var entries = [1, 2, 3, 4, 5, 6, 7]; console.log(entries.length); // 7 entries.length = 4; console.log(entries.length); // 4 console.log(entries); // [1, 2, 3, 4]

var entries = [1, 2, 3, 4, 5, 6, 7]; console.log(entries.length); // 7 entries.length = 0; console.log(entries.length); // 0 console.log(entries); // []