javascript

console.log(typeof 'abc') // string

let obj = {a: 123}; console.log('a' in obj) // true

string => 正規表現

new RegExp('ab+c');

code:a.js

let {b} = { a: 123, b: 234}

console.log(b); // 234

code:b.js

let b = 3;

let obj = {a:5, b}

console.log(obj) // { a: 5, b: 3 }

code:c.js

console.log(a) // 1

console.log(b) // 2