<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<input type="text" placeholder="请输入名称" id="username">
显示值：<p id="uName"></p>
<script>
let obj = {}
Object.defineProperty(obj,'username',{
get: function(a){
console.log(a,"取之")
},
set: function(b){
console.log(b,"shezhi")
document.getElementById('uName').innerText = b;
}
})
document.getElementById("username").addEventListener('keyup',function(){
obj.username = event.target.value
})
</script>
</body>
</html>
