标签：insert head current 60 next 链表 var newNode data
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>双向链表</title>
</head>
<body>
<script>
function DoubleList() {
this.head = null;
this.tail = null;
this.length = 0;
function Node(data) {
this.data = data;
this.prev = null;
this.next = null;
}
DoubleList.prototype.append = function (data) {
var newNode = new Node(data);
if (this.length == 0) {
this.head = newNode;
} else {
var current = this.head;
while (current.next) {
current = current.next;
}
current.next = newNode;
}
this.length += 1;
};
DoubleList.prototype.backwardString = function (data) {
//定义变量
var current = this.head;
var resultString = "";
while (current) {
resultString += current.data + " ";
current = current.next;
}
return resultString;
};
DoubleList.prototype.forwardString = function (data) {
//定义变量
var current = this.tail;
var resultString = "";
while (current) {
resultString += current.data + " ";
current = current.prev;
}
return resultString;
};
DoubleList.prototype.toString = function (data) {
//定义变量
return this.backwardString();
};
DoubleList.prototype.insert = function (position, data) {
if (position < 0 || position > this.length) return false;
var newNode = new Node(data);
if (this.length == 0) {
this.head = newNode;
this.tail = newNode;
} else {
if (position == 0) {
this.head.prev = newNode;
newNode.next = this.head;
this.head = newNode;
} else if(position==this.length) {
newNode.prev=this.tail
this.tail.next=newNode
this.tail=newNode
}else{
var current=this.head
var index=0
while(index++<position){
current=current.next
}
newNode.next=current
newNode.prev=current.prev
current.prev.next=newNode
current.prev=newNode
}
}
this.length+=1
return true
};
}
</script>
</body>
</html>
标签：insert,
head,
current,
60,
next,
链表,
var,
newNode,
data
From： https://blog.51cto.com/u_15460007/6049339