javaScript修改Object的Key值保留Value

for(var key in this.billList){ 
    //是否是billList自己身上的key
    if(this.billList.hasOwnProperty(key)){
        this.newList = Object.defineProperty(this.billList,this.time(key),Object.getOwnPropertyDescriptor(this.billList,key)) 
        delete this.newList[key] 
    } 
}

参考1：https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty
参考2：https://blog.csdn.net/starwavelin/article/details/75270572