let obj={}
Object.defineProperty(obj,'name',{
get() {
console.log("我读了")
},
set(val){
document.getElementById("sDiv").innerHTML= val
console.log("我写了")
return val
}
})
document.getElementById('inp').addEventListener('input',function(e){
console.log(e.target.value)
obj.name = e.target.value
})
<input type="text" value="" id="inp"/>
<div id="sDiv"></div>