<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta name="viewport" content="width=device-width,initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="format-detection" content="telephone=no">
<title></title>
<!-- 移动端兼容css -->
<link rel="stylesheet" href="css/mobile2.css">
<script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.js"></script>
<style>
* {
margin: 0;
}
html {
background: #fff;
100%;
height: 100%;
}
.test {
100%;
height: 3rem;
text-align: center;
line-height: 3rem;
background-color: #fff;
display: inline-block;
vertical-align: top;
color: red;
}
canvas {
margin-right: 5px;
}
.down {
float: left;
margin: 40px 10px;
}
.mn{
100%;
height: auto;
position: fixed;
top:0;
left: 0;
}
</style>
</head>
<body style="background: red;">
<div class="test">测试</div>
<div class="test">测试</div>
<div class="test">测试</div>
<div class="test">测试</div>
<div class="test">测试</div>
<div>
<div class="down" id="down">生成图片</div>
</div>
<img class="mn" src="" id="imageId" alt="">
<script>
//创建一个新的canvas
var canvas2 = document.createElement("canvas");
let _canvas = document.querySelector('html');
//此处可换body，或div等
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 * 2;
canvas2.height = h * 2;
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(2, 2);
html2canvas(document.querySelector('html'), {
canvas: canvas2
}).then(function(canvas) {
//此处html可换body，或div等
//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());
// $('.mn').attr("src",canvas.toDataURL());
// 獲取到圖片路徑
console.log(canvas.toDataURL());
var btn = document.getElementById('down');
btn.addEventListener('click', showMsg, false);
function showMsg() {
document.getElementById("imageId").src = canvas.toDataURL();
}
});
</script>
</body>
</html>
参考链接：