<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>htmltopic</title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.js"></script>
<script src="https://cdn.bootcdn.net/ajax/libs/html2canvas/0.5.0-beta4/html2canvas.js"></script>
<style>
* {
margin: 0;
}
.test {
width: 100px;
height: 100px;
text-align: center;
line-height: 100px;
background-color: #87CEEB;
display: inline-block;
vertical-align: top;
}
canvas {
margin-right: 5px;
}
.down {
float: left;
margin: 40px 10px;
}
.down2 {
float: left;
margin: 40px 30px;
}
</style>
</head>
<body>
<div class="test">
<!--<img src="wepay.png" width="20px" height="20px" alt="">-->
<img src="https://qiniu.ikjcm.com/ABC%E5%86%9C%E4%B8%9A%E9%93%B6%E8%A1%8C.png" width="20px" height="20px" alt="">
测试
</div>
<div><a class="down" href="" download="downImg">下载</a>
</div>
<div><a class="down2" href="" download="downImg">下载2</a></div>
<script>
//直接选择要截图的dom，就能截图，但是因为canvas的原因，生成的图片模糊
//html2canvas(document.querySelector('div')).then(function(canvas) {
// document.body.appendChild(canvas);
//});
//创建一个新的canvas
var canvas2 = document.createElement("canvas");
let _canvas = document.querySelector('.test');
var w = parseInt(window.getComputedStyle(_canvas).width);
var h = parseInt(window.getComputedStyle(_canvas).height);
//将canvas画布放大若干倍，然后盛放在较小的容器内，就显得不模糊了
canvas2.width = w * 3;
canvas2.height = h * 3;
canvas2.style.width = w + "px";
canvas2.style.height = h + "px";
//可以按照自己的需求，对context的参数修改,translate指的是偏移量
// var context = canvas.getContext("2d");
// context.translate(0,0);
var context = canvas2.getContext("2d");
context.scale(3, 3);//缩放，指定生成的图片大小
html2canvas(document.querySelector('.test'), {canvas: canvas2,useCORS:true,logging:true}).then(function (canvas) {
//document.body.appendChild(canvas);
//canvas转换成url，然后利用a标签的download属性，直接下载，绕过上传服务器再下载
document.querySelector(".down").setAttribute('href', canvas.toDataURL());
});
</script>
<script language="javascript">
//这是另一种写法
$(function () {
$(".down2").click(function () {
html2canvas($(".test")).then(function (canvas) {
var imgUri = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream"); // 获取生成的图片的url
console.log(imgUri)
window.location.href = imgUri; // 下载图片
});
//html2canvas($('.tongxingzheng_bg'), {
// onrendered: function (canvas) {
// var data = canvas.toDataURL("image/png");//生成的格式
// //data就是生成的base64码啦
// alert(data);
// }
//});
});
});
</script>
</body>
</html>
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