![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>canvas多张图片上传</title>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.min.js"></script>
</head>
<style type="text/css">
#ip{font-size: 28px;color: red}
#img{display: none;}
</style>
<body>
<canvas id="canvas" width="300" height="300" style="border:1px solid #ccc;display: block; margin: 0 auto;">
</canvas>
<img src="" id="img">
<input type="file" id="file" name="">
</body>
<script type="text/javascript">
$('#file').change(function(e){
var file=e.target.files[0];
var url=window.URL.createObjectURL(file);
var img=document.getElementById('img');
img.src=url;
img.onload=function(){
var canvas=document.getElementById('canvas');
var sy=document.getElementById('sy');
var ctx=canvas.getContext('2d');
var tempw=img.width;
var temph=img.height;
img.width=500;
img.height=500/tempw*temph;
canvas.width=img.width;
canvas.height=img.height;
ctx.drawImage(img,0,0,canvas.width, canvas.height);
// ctx.fillStyle="rgba(252,255,255,0.7)";
// ctx.fillRect(0,0,150,75);
ctx.font="30px 微软雅黑";
ctx.fillText("PengLi",10,50);
//ctx.drawImage(sy,0,0);
var dataUrl=canvas.toDataURL("image/jpeg",0.9);
console.log(dataUrl);
}
})
</script>
</html>点击 "运行实例" 按钮查看在线实例
