
然后给父级盒子设置position: relative给子级的箭头盒子设置position: absolute
例如:
<div class="box">
<div class="box-img">
<img src="images/a001.png"/>
</div>
<div class="box-jt">
<img src="images/箭头.png"/>
</div>
</div>
.box{
width:80%
margin:0 auto
position: relative
}
.box-img{
width:100%
}
.auto-img{
width:100%
display: block
}
.box-jt{
width:80px
position: absolute
top:50%
left:50%
transform: translate(-50%, -50%)
}
<!DOCTYPE html><html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<canvas id="canvas" width="1000px" height="1000px"></canvas>
<script>
const canvas=document.getElementById('canvas')
const ctx=canvas.getContext('2d')
</body>
</html>
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