KinoOfficial
commented
1 year ago Map const map = new Map([ ['name', '张三'], ['title', 'Author'] ]);
set(key, value) :set方法设置键名key对应的键值为value const m = new Map(); const o = {p: 'Hello World'}; m.set(o, 'content')
get(key) get方法读取key对应的键值，如果找不到key，返回undefined
For in 循环: 循环key值 let obj={ a:1, b:2, c:3, } for(let i in obj) { console.log(i) //a b c console.log(obj[i]) // 1 2 3 } For of 循环:循环value值（不能遍历对象）