Ammy的成长

CommonJs AMD RequireJs

for…in(遍历数组对象的键名) let list = [4, 5, 6]; for (let i in list) { console.log(i); // "0", "1", "2", } let obj ={a:1,b:2} for (let i in obj ) { console.log(i); // "a", "b" } for…of(遍历数组的键值) for ...