javascript继承--call()和apply实现继承

　　call方法是Function对象中的方法,因此我们定义的每个函数都拥有该方法。可以通过函数名来调用call方法,call方法的第一个参数会被传递给函数中的this,从第2个参数开始,挨个赋值给函数中的参数

function person(name){
alert(name+"  :  "+this.hobby);
}
var obj=new Object();
obj.hobby="打酱油";
person.call(obj,"小张");

(2)

<script language="javascript" type="text/javascript">
function Parent(name){
this.name=name;
this.sayHello=function(){
alert(this.name);
}
}
function Child(name,hobby){
this.hobby=hobby;
Parent.call(this,name);
this.say=function(){
alert(this.name+"  :  " +this.hobby);
}
}
var ch=new Child("小明","打酱油");
ch.sayHello();
ch.say();
</script>

apply方法实现继承

function Parent(name){
this.name=name;
this.sayHello=function(){
alert(this.name);
}
}
function Child(name,hobby){
this.hobby=hobby;

Parent.apply(this,[name]/* 或者new Array(name) */);
this.say=function(){
alert(this.name+"  :  "+this.hobby);
}
}
var ch=new Child("小明","打酱油");
ch.sayHello();
ch.say();