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demo5.html
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demo5.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
*{
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<canvas id="canvas" width="200" height="200"></canvas>
<canvas id="canvas2" width="400" height="400"></canvas>
<script>
function No(ele){
var canvas = document.querySelector(ele),
ctx = canvas.getContext('2d');
function draw(x){
ctx.clearRect(0,0,200,200);
ctx.beginPath();
ctx.lineWidth = 20;
ctx.lineCap = 'round';
ctx.lineJoin = 'round';
ctx.moveTo(20,20);
ctx.lineTo(20+x,20+x);
ctx.stroke();
ctx.beginPath();
ctx.lineWidth = 20;
ctx.lineCap = 'round';
ctx.lineJoin = 'round';
ctx.moveTo(180,20);
ctx.lineTo(180-x,20+x);
ctx.stroke();
}
let x =0
function step() {
x++
if(x>=160){
x = 0;
setTimeout(()=>{
step()
},3000)
return;
}
draw(x)
requestAnimationFrame(step)
}
step()
}
No('#canvas')
No('#canvas2')
</script>
</body>
</html>