Create a linked list using js objects

//The following is a linked list class

function LinkedList(){

//Node represents the item to be added to the list
var Node=function(element){

<br/>

　this.element=element;
　this.next= null;
};

var length=0;//Storage the number of list items
var head=null;//head stores a reference to the first node

//Append elements to the end of the linked list
this. append=function(element){
　var node=new Node(element),
　current;

if(head===null){
　head=node;

　}else{
　current=node;

　while( current.next){
　　　current=current.next;
　　}

　　current.next=node;

　　}

　length++;
};

//Insert an element at any position in the linked list
this.insert=function (position,element){
　if(position>=0&&position<=length){<br/><br/>　var node=new Node(element),<br/>　　current=head,<br/>　　previous,<br/>　　index=0;<br/><br/>　if(position=== 0){<br/>　　　node.next=current;<br/>　　head=node;<br/><br/>　　}else{<br/>　　while(index-1 && position　　var current=head,
　　previous,
　　index=0;

　　if(position===0){
　　head=current.next;
　　} else{

　　while(index　　　previous=current;
　　current=current.next;
　　　index++;
　　　}
　　　previous.next=current.next;

　　}

　length--;

　　return current .element;
　}else{
　　return null;
　　}
};

//Return the position of the element in the linked list
this.indexOf=function(element){
　var current=head,
　index=-1;
U While (Current) {
if (Element === Current.element) {
Return Index;
}
Index ++;
Current = Current.next; / / Remove an element
this.remove=function(element){

　var index=this.indexOf(element);

　return this.removeAt(index);
};

//Judge whether the linked list is empty

this .isEmpty=function(){
　Return length===0;
};

//Return the length of the linked list
this.size=function(){
return length;
};

//Convert the LinkedList object into a string

this.toString=function(){

　var current=head,
　string="";

　while(current){
　　string=current.element;

　　current=current.next;

　}

return string;

};

};

var list=new LinkedList();
list.append(15);
list.append(10);
list.insert(1,11);

list.removeAt (2)

console.log(list.size());