麻烦老师检查
来源：8-2 编程练习
Yuri沫
2020-04-24 15:20:46
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>canvas动画</title>
<style>
canvas{background-color:lightblue;}
</style>
</head>
<body>
<canvas width="800px" height="800px" id="canvas">您的浏览器不支持canvas</canvas>
<script>
var canvas=document.getElementById("canvas");
var context=canvas.getContext("2d");
//补充代码
var posx=150, posy=0, dir=1;
context.fillStyle="green";
setInterval(function(){
posy += 10*dir;
context.clearRect(0,0,canvas.width,canvas.height);
context.fillRect(posx,posy,50,50);
if(posy + 50 >= canvas.height){
dir = -1;
}else if(posy <= 0){
dir = 1;
}
},100);
</script>
</body>
</html>
1回答
-
同学你好，代码是正确的，继续加油， 祝学习愉快~
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