JS使用new操作符创建对象的方法分析

<script>
function Constructor(name){
this.name = name
}
var person1 = Constructor("张三");//undefined
var person2 = new Constructor("张三");//得到一个对象｛name:"张三"｝
console.log(person1);
console.log(person2);
</script>

function Constructor(name){
this.name = name
return this.name;
}
var person = new Constructor("123");//Constructor {name: "123"};Object,因为基本类型的prototype都是Object
function Constructor(name){
this.name = name
return new String(this.name);
}
var person = new Constructor("123");//String {0: "1", 1: "2", 2: "3", length: 3, [[PrimitiveValue]]: "123"},
console.log(person);