Javascript对象继承(复制继承法)
Javascript对象继承(复制继承法)
复制继承可以说是Javascript中我使用的最多的继承方法.
复制继承是如何实现的,我们一起来看看下面的例子:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
function dw(s) {
document.write(s + "<br />");
}
//一个一个复制父类的属性
Function.prototype.extendcopy = function(obj) {
for(var each in obj){
this.prototype[each] = obj[each];
}
}
//警察
function PoliceMan() {
var m_lifeEnergy = 100;
this.getLifeEnergy = function () {
return m_lifeEnergy;
}
this.Shot = function () {
m_lifeEnergy -= 1;
}
this.Repair = function() {
m_lifeEnergy += 1;
}
}
//超级警察
function SuperPoliceMan() {
this.Flight = function() {
}
}
//复制继承
SuperPoliceMan.extendcopy(new PoliceMan());
//创建一个超级警察
var pm = new SuperPoliceMan();
//显示当前生命值
dw(pm.getLifeEnergy());
//中枪生命值减1
pm.Shot();
//显示当前生命值
dw(pm.getLifeEnergy());
//飞离地面
pm.Flight();
//自我修复
pm.Repair();
//显示当前生命值
dw(pm.getLifeEnergy());
</script>
</head>
<body>
</body>
</html>