初试javascript: 贪吃蛇

　2007-12-07 22:22:33　来源：WEB开发网　　　

核心提示：一直没有过多地接触javascript，近日看了一下，初试javascript: 贪吃蛇，准备试试手，于是参考 lxx8402的俄罗斯方块方法，写的仓促，也没有放积分，写了个贪吃蛇的小游戏，源代码如下

　　一直没有过多地接触javascript，近日看了一下，准备试试手。于是参考 lxx8402的俄罗斯方块方法，写了个贪吃蛇的小游戏，源代码如下，写的仓促，也没有放积分，参数可以自己修改前面的默认值：

tcs.html:

<!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.0 Transitional//EN>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME=Generator CONTENT=EditPlus>
<META NAME=Author CONTENT=>
<META NAME=Keywords CONTENT=>
<META NAME=Description CONTENT=>
<meta http-equiv=Content-Type content=text/html; charset=gb2312>
<STYLE>
.btnup{
　　　　 border-left:solid #ffffff 1px;
　　　　 border-top:solid #ffffff 1px;
　　　　 border-right:solid #828486 1px;
　　　　 border-bottom:solid #828486 1px;
　 font-size: 9pt;
　 cursor:default
　　　 }
tr{
font-family:宋体;
font-size: 9pt;
cursor: default
}
</STYLE>
</HEAD>
<SCRIPT LANGUAGE=JavaScript>
<!--
var row = 25,col = 25,size=16;
var delay = 300;//移动延迟
var paused = false;
var end = false
var TimerID;
var s = new snake();
var n = new nut();
var nutad = new Array();
nutad[0] = -1;
nutad[1] = -1;
var Color = new Array(5);
Color[0] = #d0d0d0;
Color[1] = red;
Color[2] = green
Color[3] = blue;
Color[4] = yellow;
var move_direction = new Array();
var curr_direction = new Array();
move_direction[0] = 1;
move_direction[1] = 0;

//========================================
//定义果实
function nut()
{
this.x = -1;
this.y = -1;
}

function nut_show()
{
if (this.x<0 || this.y < 0 )
　return;
obj = document.all(Main + this.x + # + this.y);
obj.style.background = Color[2];
}

function nut_eated()
{
if (this.x<0 || this.y < 0)
　return;
obj = document.all(Main + this.x + # + this.y);
obj.style.background = Color[0];
}
nut.prototype.create = nut_create;
nut.prototype.show = nut_show;
nut.prototype.eated = nut_eated;

//========================================
//定义蛇体
function snake()
{
this.items = new Array();
}

function snake_eat(nt)
{
var s_length = this.items.length;
this.items[s_length] = nt;
}

function snake_move(dir)
{
this.destroy();
var y = this.items[0].y;
var x = this.items[0].x;
var nx = x + dir[1];
var ny = y + dir[0];
if (nx <0 || nx >= row || ny <0 || ny >= col || crossed(nx,ny))
{
　end = true;
　return;
}
caneat(nx,ny);
for (var i = this.items.length-1 ; i>=0 ; i --)
{

　if (i != 0)
　{
　 this.items[i].move(this.items[i-1].x,this.items[i-1].y);
　}
　else
　{
　 this.items[i].move(nx,ny);　
　}
}
this.reload();
}

function caneat(nx,ny)
{
if (nx == nutad[0] && ny == nutad[1])
{
　var lst = s.items[s.items.length-1];
　var nd = new snakeNode(lst.x,lst.y);
　s.eat(nd);
　n.eated();
　n.create();
}

}
//禁止穿越自身节点
function crossed( nx, ny )
{
for (var i = 0; i<s.items.length; i++)
{
　if (s.items[i].x == nx && s.items[i].y == ny)
　{
　 return true;
　}
}
return false;
}

function snake_reload()
{
for (var i = 0 ; i<this.items.length ; i ++)
{
　var curNode = this.items[i];
　obj = document.all(Main + curNode.x + # + curNode.y);
　obj.style.background = Color[1];
}
}

function snake_destroy()
{
for (var i = 0 ; i<this.items.length ; i ++)
{
　var curNode = this.items[i];
　obj = document.all(Main + curNode.x + # + curNode.y);
　obj.style.background = Color[0];
}
}

function snake_clear()
{
this.destroy();
this.items = new Array();
}

snake.prototype.eat = snake_eat;
snake.prototype.move = snake_move;
snake.prototype.reload = snake_reload;
snake.prototype.destroy = snake_destroy;
snake.prototype.clear = snake_clear;

//蛇体节点
function snakeNode(x,y)
{
this.id = 0;//编号
this.x = x;//坐标X
this.y = y;//坐标Y
this.color = #000000;
}

function snakeNode_setC(d_color)
{
this.color = d_color;
}

function snakeNode_move(dx,dy)
{
this.x = dx;
this.y = dy;
}

snakeNode.prototype.setColor = snakeNode_setC ;
snakeNode.prototype.move = snakeNode_move ;

//========================================
//程序界面
//初始化主控制区
function DrawArea(row,col,name){
var s = <TABLE BORDER=1 cellspacing=0 cellpadding=1 bgcolor= + Color[0] + >;
for(var i=0; i<row; i++){
s = s + <TR Height= + size + >;
for(var j=0; j<col; j++){
　 var id = name + i + # + j;
　 s = s + <TD Width= + size + class=btnup id= + id;
　 s = s + style=\background: + Color[0] + \> </TD>
}
s = s + </TR>;
}
s = s + </TABLE>;
return s;
}

//初始化
function Init(){
MainArea.innerHTML = DrawArea(row,col,Main);
}

//==================================
//程序控制区，用来接收输入、定义控制方法
//控制输入
function keyDown(){
switch(event.keyCode)
{
　case 37:
　 if (curr_direction[0] != -1)
　 {
　 move_direction[0] = -1;
　 move_direction[1] = 0;
　 }
　 break;
　case 38:
　 if (curr_direction[1] != -1)
　 {
　 move_direction[0] = 0;
　 move_direction[1] = -1;
　 }
　 break;
　case 39:
　 if (curr_direction[0] != 1)
　 {
　 move_direction[0] = 1;
　 move_direction[1] = 0;
　 }
　 break;
　case 40:
　 if (curr_direction[1] != 1)
　 {
　 move_direction[0] = 0;
　 move_direction[1] = 1;
　 }
　 break;
}
}

function Begin()
{
end = false;
paused = false;
s.clear();
for (var i = 8; i >=0 ; i--)
{
　sn = new snakeNode(0,i);
　s.eat(sn);
}
n.eated();
n.create();
move_direction[0] = 1;
move_direction[1] = 0;
curr_direction[1] = s.items[1].x - s.items[0].x;
curr_direction[0] = s.items[1].y - s.items[0].y;
Start();
}

//启动开关
function Start()
{
if (end)
{
　s.reload();
　alert(挂了！);
　return;
}
window.clearInterval(TimerID);
TimerID = window.setInterval(Run(),delay);
}

//运行主体
var d = true;
function Run(){
if(paused) return;
if(true){
　window.clearInterval(TimerID);
　s.move(move_direction);
　curr_direction[1] = s.items[1].x - s.items[0].x;
　curr_direction[0] = s.items[1].y - s.items[0].y;
　Start();
}
}

//暂停开关
function Pause()
{
if (paused)
{
　paused = false;
　if (!end)
　{
　 Run();
　}
}
else
{
　paused = true;
}
}

//结束
function Over()
{
end = true;
}
//-->
</SCRIPT>
<BODY BGCOLOR=#FFFFFF onload=Init() onkeydown=keyDown() leftmargin=0 topmargin=0 marginwidth=0 marginheight=0>
<TABLE border=0 cellspacing=0 cellpadding=0 align=center width=80%>
<TR>
<TR valign=top width=80%>
<TD><SPAN ID=MainArea></SPAN></TD>
<TD align=center>
<BUTTON ID=start onclick=Begin()>Start</BUTTON><br>
<BUTTON ID=pause onclick=Pause()>pause</BUTTON><br>
<BUTTON ID=over onclick=Over()>End</BUTTON><br>
</TD>
</TR>
</TABLE>
</BODY>
</HTML>