1 Object.keys
var list = {a:123,b:456,c:789}
Object.keys(list).forEach(item => console.log(item))
//a
//b
//b
Object.keys(list).forEach(item => console.log(list[item]))
//123
//456
//789
2 for in
for (let key in list ) {
console.log(key)
}
//a
//b
//c
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