Javascript的继承可以通过call、apply、prototype实现。
1、call：在子类中，用父类.call（this，arg0，arg1...）可以继承父类。注意call的位置，尽量在子类的第一行（js按顺序执行，放在后面可能对子类的其他属性、方法有影响。比如子类和父类有相同名字的方法，后面的覆盖前面的）。
<html>
<head>
<title>call\apply\prototype test</title>
</head>
<script type="text/javascript">
//person类
function person(name, age) {
this.name = name;
this.age = age;
this.say = function() {
document.write("I am a person");
}
this.display = function() {
document.write(this.name + "-" + this.age);
}
}
//student类，继承自person
function student(name, age, no) {
person.call(this, name, age);//person中的this等于参数中的this，即student中的name和age
this.no = no;
this.display = function() {//覆盖了父类的方法
document.write(this.name + "-" + this.age + "-" + this.no);
}
}
//创建person类
var p = new person("captain", 21);
p.display();//captain-21
p.say();//I am a person
//创建student类
var s = new student("captain", 21, "06281097")
s.display();//captain-21-06281097
s.say();//I am a person 继承了父类的方法
<script>
<body>
</body>
</html>
2、apply：在子类中，用父类.apply（this，args）可以继承父类（args为参数数组）。
<html>
<head>
<title>call\apply\prototype test</title>
</head>
<script type="text/javascript">
//person类
function person(name, age) {
this.name = name;
this.age = age;
this.say = function() {
document.write("I am a person");
}
this.display = function() {
document.write(this.name + "-" + this.age);
}
}
//student类，继承自person
function student(name, age, no) {
person.apply(this, new Array(name, age));//与call不同的是，apply传递的是数组
this.no = no;
this.display = function() {//覆盖了父类的方法
document.write(this.name + "-" + this.age + "-" + this.no);
}
}
//创建pe
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