1、使用Object.keys()遍历

const str={"name":"duxin","num":"253","index":"958"}

Object.keys(str).forEach((key)=>{console.log(key)})

2、for..in遍历

for(let i in str){
    console.log(i+"===="+str[i])
}

3、Object.getOwnPropertyNames(obj)

Object.getOwnPropertyNames(str).forEach((key)=>{
    console.log(key+"===="+str[key])
})

4、Reflect.ownKeys(obj)

Reflect.ownKeys(str).forEach((key)=>{
   console.log("对象索引为："+key) 
})