Object.assign()
复制一个访问器属性最终会转换为一个数据属性

var receiver = {}

var supplier= {
get name(){
return "holle world"
}
}

Object.assign(receiver,supplier)

receiver
{name: "holle world"}

receiver.name
"holle world"

supplier.name
"holle world"

var descriptor = Object.getOwnPropertyDescriptor(receiver,"name")
descriptor
{value: "holle world", writable: true, enumerable: true, configurable: true}configurable: trueenumerable: truevalue: "holle world"writable: true__proto__: Object

var descriptor1 = Object.getOwnPropertyDescriptor(supplier,"name")
descriptor1
{set: undefined, enumerable: true, configurable: true, get: ƒ}configurable: trueenumerable: trueget: ƒ name()set: undefined__proto__: Object