示例代码

一个简单的运动的方块。

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>jQuery Snake</title>
<style type="text/css">
body {
    background: #eeeeee;
}
canvas {
    border: 1px solid gray;
}
</style>
<script type="text/javascript">
    var Block = {
        X : 0,
        Y : 0,
        TimeClock : null
    }
    function test() {
        var ctx = document.getElementById('test').getContext('2d');
        ctx.save();
        ctx.clearRect(0,0,600,400);//清理画布
        ctx.translate(Block.X,Block.Y);
        ctx.fillRect(0,0,10,10);
        if(Block.Y <= 380){
            Block.X += 10;
            Block.Y += 10;
        }
        ctx.restore();
    }
    function start(){// 开始
        Block.TimeClock = setInterval(test, 800);//0.8秒
    }
    function stop(){//暂停
        if(Block.TimeClock){
            clearTimeout(Block.TimeClock);
        }
    }
</script>
</head>
<body>
    <canvas id='test' width='600' height="400"></canvas>
    <button onclick="start();">start</button>
    <button onclick="stop();">stop</button>
</body>
</html>

效果图：comment

carton demo: a move block

comment. 这是个动态图。可以保存代码为html，然后在浏览器中打开查看效果 ↩

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