frontEnd++：使用 html2canvas 实现浏览器截图
html2canvas 可以通过纯JS对浏览器网页进行截屏，但截图的精确度还有待提高
官网： http://html2canvas.hertzen.com/
gitHub: https://github.com/niklasvh/html2canvas
引用 ： <script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.js"></script>
使用如下：具体详解 请查阅官方文档
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<title>网页DOM元素截图</title>
<script type='text/javascript' th:src='@{/js/jquery-3.2.0.min.js}'></script>
<script type='text/javascript' th:src='@{/js/screenshot/html2canvas.js}'></script>
</head>
<script type="text/javascript">
$(function () {
$('#btn').click(function () {
//#proMain:要截图的DOM元素
//useCORS:true:解决跨域问题
html2canvas(document.querySelector('#cut'), {useCORS: true}).then(function (canvas) {
//获取年月日作为文件名
var timers = new Date();
var fullYear = timers.getFullYear();
var month = timers.getMonth() + 1;
var date = timers.getDate();
var randoms = Math.random() + '';
//年月日加上随机数
var numberFileName = fullYear + '' + month + date + randoms.slice(3, 10);
var imgData = canvas.toDataURL("image/png");
//保存图片
var saveFile = function (data, filename) {
/* var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a');
save_link.href = data;
save_link.download = filename;
var event = document.createEvent('MouseEvents');
event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
save_link.dispatchEvent(event);*/
/*--------------------------------------------------------方式二----------------------------------------------------*/
let triggerDownload = $("<a>").attr("href", data).attr("download", filename).appendTo("body");
triggerDownload[0].click();
triggerDownload.remove();
};
//最终文件名+文件格式
var filename = numberFileName + '.png';
// 下载图片(保存图片)
saveFile(imgData, filename);
// 把截的图显示在网页上
var img = document.createElement('img');//创建一个标签
img.setAttribute('src', imgData);//给标签定义src链接
document.getElementById('box').appendChild(img);
})
})
// 代理事件(append之后的标签无法设置事件)
$('#box').on('click', function (e) {
var target = e.target || e.srcElement;//获取当前点击的对象
console.log(target.src)
$('.bigImg').attr('src', target.src);
$('.bigImg').css('display', 'block')
});
});
</script>
<body>
<button id="btn">截图</button>
<fieldset>
<legend>显示图片</legend>
<div id="box"></div>
</fieldset>
<div id="cut" style="height: 300px;width: 300px;border: 1px solid red;text-align: center;">
<h1>ABC</h1>
</div>
</body>
</html>
