js实现简单的单链表

1. [代码][JavaScript]代码    

function Entry(next, data)
{
    this.next = next;
    this.data = data;
}
function List()
{
 this.head=new Entry(null,null);
 this.end=new Entry(null,null);
 this.add=function(data)
{
 var newentry=new Entry(null,data);
 if(this.head.data)
 {
  this.end.next=newentry;
  this.end=newentry; 
 } 
 else
 {
  this.head=newentry;
  this.end=newentry;   
 }
};
this.show=function()
{
 var temp=this.head;
 for(;temp!=null;temp=temp.next)
 {
  alert(temp.data); 
 } 
}; 
}

var a=new List();

a.add(1);
a.add(2);
a.add(3);
a.show();