dickeylth/jsbin.OjiFucu.html

## jsbin.OjiFucu.html
<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>

</body>
</html>

## jsbin.OjiFucu.js
function Person(){
    // 缓存实例
    var instance = this;

    // 添加属性
    this.attr = "Attribute";

    // 重写该构造函数
    Person = function(){
        return instance;
    };
}

Person.prototype.job = 'FE';

var p1 = new Person();

Person.prototype.city = 'Beijing';

var p2 = new Person();

console.log(p1);
console.log(p2);
console.log(p1.constructor === Person);
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset=utf-8 />
	<title>JS Bin</title>
	</head>
	<body>

	</body>
	</html>
	function Person(){
	// 缓存实例
	var instance = this;

	// 添加属性
	this.attr = "Attribute";

	// 重写该构造函数
	Person = function(){
	return instance;
	};
	}

	Person.prototype.job = 'FE';

	var p1 = new Person();

	Person.prototype.city = 'Beijing';

	var p2 = new Person();

	console.log(p1);
	console.log(p2);
	console.log(p1.constructor === Person);