下载是模拟的俄罗斯方法的效果，在下落的情况下，能
<!DOCTYPE HTML>
<html>
<head>
<title>Shot</title>
<meta charset="gbk" />
<link type="text/css" href="canvas.css" rel="stylesheet"/>
</head>
<body onkeydown="getCommand();">
<canvas id="canvas" width="880" height="400" style="background:black">
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</canvas>
</body>
<script >
var canvas = document.getElementById("canvas");
var cxt = canvas.getContext("2d"); function Shot(x,y,speed){
this.x = x;
this.y = y;
this.speed = speed;
this.move = function (){
if(this.y > 400){
this.y = 40;
}
this.y +=speed;
}
this.moveRight = function (){
this.x +=speed;
}
this.moveLeft = function (){
this.x -=speed;
}
this.moveUP = function (){
this.y -=speed;
}
}
var shot = new Shot(40,40,10);
//var shots = new Array(); function drawShot(tank){
cxt.fillStyle = "#ded284";
cxt.beginPath();
cxt.fillRect(tank.x,tank.y,5,10);
cxt.closePath();
}
function getCommand(){
var code = event.keyCode;
switch(code) {
case 87: //上
shot.moveUP();
break;
case 68: //右
shot.moveRight();
break;
case 83: //下
shot.move();
break;
case 65: //左enemyTanks[i]
shot.moveLeft();
break;
case 74:
break;
}
drawShot(shot);
}
function run(){
cxt.clearRect(0,0,880,400);
//cxt.clearRect(0,0,880,400);
shot.move();
drawShot(shot); }
//function flashTankMap(){
//刷新作战莵E
//清历篆布
//}
//run();
window.setInterval("run()",100);
</script>
</html>
够对其进行控制，不过做的环形的还是不多