iframe-proxy | Sunbelt Computer Software

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
		<title>object3</title>
		<meta name="author" content="Administrator" />
		<!-- Date: 2016-04-10 -->
		<script type="text/javascript" charset="utf-8">
			// 1 js 实现继承
			function AClass(){
				this.propertyA = 'aa';
				this.methodA = function(){
					alert("a method!");
			function BClass(){
				this.propertyB = 2;
				this.methodB = function(){
					alert("b method!");
			BClass.prototype = new AClass(); // 这一步就是继承父类
			var b = new BClass();
			alert(b.propertyA);
			alert(b.propertyB);
			b.methodA();
			b.methodB();
			// 2 (如何在子类中重新定义父类的成员)：这个例子说明了子类如何重写父类的属性或方法。
			BClass.prototype = new AClass(); // 这一步就是继承父类
			BClass.prototype.propertyA = 'AA';
			BClass.prototype.methodA = function(){
				alert("A method!");
			var b = new BClass();
			alert(b.propertyA);
			alert(b.propertyB);
			b.methodA();
			b.methodB();
		</script>

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