javascript中的隐藏的对象

[b]Call[/b]
[b]Apply[/b]
[b]prototype[/b]
var person= function(){
};
person.prototype.say = function(){

}
//[b]call[/b]
function class1(name){
this.name = name
this.showName (){
alert(this.name);
}
}
function class2(name){
this.name = name
class1.call(this);//把class1 赋给class2
}
var selection = document.getElementById('myselect');
var coloneselection = document.createElement('select');
coloneselection = selection.cloneNode(true)//完全拷贝