老师，请检查
来源：8-2 编程练习
慕尼黑5122342
2019-12-19 16:40:56
<!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 px=100,py=0,a=1;
context.fillStyle='green';
// context.fillRect(px,py,100,100);
setInterval(function (){
context.clearRect(0,0,200,800);
context.fillRect(px,py,100,100);
py+=10*a;
if(py+100>=800){
a=-1;
}else if(py<=0){
a=1;
}
},100);
</script>
</body>
</html>
1回答
-
同学你好，要把代码中注释打开才能实现效果：
如果我的回答帮到了你，欢迎采纳，祝学习愉快~
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