一：arguments.callee
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
/*
var facorial=function(num){
if (num<1) {
return 1;
}else{
return num*facorial(num-1);
}
}*/
var facorial=function(num){
if (num<1) {
return 1;
}else{
return num*arguments.callee(num-1);//arguments.callee代表当前函数
}
}
var another=facorial;
facorial=function(){
return 1;
}
alert(facorial(5));
alert(another(5));
</script>
</head>
<body>
</body>
</html>
二：Prototype
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function Father(name,age){
this.name=name;
this.age=age;
}
Father.prototype.sayHi()=function(){
alert("age+"+this.age+",name="+this.name);
}
//定义子类
function Son(name,age,gender){
this.gender=gender;
Father.call(this,name.age);
}
Son.prototype=new Father();//这种写法是为了防止父类里面有子类的方法
Son.prototype.fungame=function(){};
var f1=new Father("F",29);
f1.sayHi();
var s1=new Son("S",true);
</script>
</head>
<body>
</body>
</html>
四：闭包
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function Closure(){
var capturedVariable="capturedVariable";
return function(){
alert(capturedVariable);
};
}
var closure=Closure();
closure();
</script>
</head>
<body>
</body>
</html>