用html5标签让小球动起来
!DOCTYPE htML>
html>
head>
meta charset='utf-8'/>
/head>
body onkeydown="changeDirect()">
canvas id='tankMap' width='500px' height='300px' style='background-color:black'>
你的浏览器不支持canvas标签/canvas>
/body>
script>
//开始画出我们的tanke
VAR canvas = document.getElementById('tankMap');
//相当于获得画笔
var ctx = canvas.getContext('2d');
var myX = 30;
var myy = 30;
//把生成小球的代码封装到一个函数中
function createBall(){
ctx.fillStyle = '#FF0000';
ctx.beginPath();
ctx.arc(myX,myY,5,0,Math.PI*2,true);
ctx.closePath();
ctx.fill();
}
createBall();
function changeDirect(){
//触发事件后,传递参数 event
var keycode = event.keyCode;
swITch(keycode){
case 87:
//alert('up');
myY--;
break;
case 68:
myX++;
break;
case 83:
myY++;
break;
case 65:
myX--;
break;
}
ctx.clearRect(0,0,500,300);
createBall();
}
/script>
/html>
!DOCTYPE html>
html>
head>
meta charset='utf-8'/>
/head>
body onkeydown="changeDirect()">
canvas id='tankMap' width='500px' height='300px' style='background-color:black'>
你的浏览器不支持canvas标签/canvas>
/body>
script>
//开始画出我们的tanke
var canvas = document.getElementById('tankMap');
//相当于获得画笔
var ctx = canvas.getContext('2d');
var myX = 30;
var myY = 30;
//把生成小球的代码封装到一个函数中
function createBall(){
ctx.fillStyle = '#FF0000';
ctx.beginPath();
ctx.arc(myX,myY,5,0,Math.PI*2,true);
ctx.closePath();
ctx.fill();
}
createBall();
function changeDirect(){
//触发事件后,传递参数 event
var keycode = event.keyCode;
switch(keycode){
case 87:
//alert('up');
myY--;
break;
case 68:
myX++;
break;
case 83:
myY++;
break;
case 65:
myX--;
break;
}
ctx.clearRect(0,0,500,300);
createBall();
}
/script>
/html>
觉得可用,就经常来吧! 欢迎评论哦! html5教程,巧夺天工,精雕玉琢。小宝典献丑了!
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