js中的继承与重写

rt.

用function 分别定义Person和Account类模型，其中Account从Person继承，并重写toString()方法

<script type="text/javascript">
	function go() {
		var acc1 = new Account("Taro", "Shibuya1-1-2", "1001", 20000);
		var acc2 = new Account("Hanako", "Akasaka2-3-4", "1002", 35000);
		acc1.toString();
		acc2.toString();
	}

	// 定义Person构造器
	function Person(name, address) {
		this.name = name;
		this.address = address;
	}

	// 在Person.property中添加toString方法
	Person.prototype.toString = function() {
		document.write(this.name + " " + this.address + "<br>");
	}

	// 定义Account构造器
	function Account(name, address, number, amount) {
		// 从Person继承
		this.newObj = Person;
		this.newObj(name, address);
		delete this.newObj;

		// Account特有属性
		this.number = number;
		this.amount = amount;
	}

	Account.prototype = Object.create(Person.prototype);
	// 设置"constructor" 属性指向Account
	Account.prototype.constructor = Account;

	// 更改Person中toString方法
	Account.prototype.toString = function() {
		document.write(this.name + "  " + this.address
				+ "  " + this.amount + "<br>");
	}

	Account.prototype.deposit = function(x) {
		this.amount += x;
	}

	Account.prototype.withdraw = function(x) {
		this.amount -= x;
	}
</script>

end.