<!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>
<script>
function abc(name,age,sex){
this.name = name;
this.age = age;
this.sex = sex;
}
abc.prototype.nationality = '中国';
var abca = new abc('wulei',30,'nv');
console.log(abca);
abca.hasOwnProperty('name');
alert('name' in abca);
</script>
</body>
</html>