对html进行截图并保存为本地图片

时间：2022-03-15 10:05:47
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>html2canvas_download</title>
<style>
            a {
                cursor: pointer;
                color: rgb(85, 26, 139);
                text-decoration: underline;
}
</style>
</head>

<body>
<div id="oDiv" style="width: 300px; height: 300px; margin: 10px; background: red; border: 5px solid gray;">
<h1>hello world!</h1>
</div>

<!-- <script type="text/javascript" src="../dist/html2canvas.js"></script> -->
<script src="https://cdn.bootcss.com/html2canvas/0.5.0-beta4/html2canvas.min.js"></script>
<script type="text/javascript">
var oDiv = document.getElementById('oDiv');

// body截图
// html2canvas(document.body).then(function(canvas) {
//     document.body.appendChild(canvas);
// });

            html2canvas(oDiv).then(function(canvas) {
                document.body.appendChild(canvas);
var oCavans = document.getElementsByTagName('canvas')[0];
var strDataURI = oCavans.toDataURL();
                downLoadFn(strDataURI);
            });

//判断浏览器类型
function myBrowser() {
var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
var isOpera = userAgent.indexOf("Opera") > -1;
if(isOpera) {
return "Opera"
                }; //判断是否Opera浏览器
if(userAgent.indexOf("Firefox") > -1) {
return "FF";
                } //判断是否Firefox浏览器
if(userAgent.indexOf("Chrome") > -1) {
return "Chrome";
                }
if(userAgent.indexOf("Safari") > -1) {
return "Safari";
                } //判断是否Safari浏览器
if(userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera) {
return "IE";
                }; //判断是否IE浏览器
if(userAgent.indexOf("Trident") > -1) {
return "Edge";
                } //判断是否Edge浏览器
            }

//IE浏览器图片保存本地
function SaveAs5(imgURL) {
var oPop = window.open(imgURL, "", "width=1, height=1, top=5000, left=5000");
for(; oPop.document.readyState != "complete";) {
if(oPop.document.readyState == "complete") break;
                }
                oPop.document.execCommand("SaveAs");
                oPop.close();
            }

// chrome14+,firefox20+,pera15+,Edge 13+,Safari未实现
function download(strDataURI) {
var link = document.createElement('a');
                link.innerHTML = 'download_canvas_image';
                link.download = 'mypainting.png';
                link.addEventListener('click', function(ev) {
                    link.href = strDataURI;
                }, false);
                document.body.appendChild(link);
            };

function downLoadFn(url) {
if(myBrowser() === "IE" || myBrowser() === "Edge") {
                    SaveAs5(url);
                } else {
                    download(url);
                }
            }
</script>
</body>

</html>

 参考：http://blog.csdn.net/luckyJieXu/article/details/72137147，https://developer.mozilla.org/zh-CN/docs/Web/API/HTMLCanvasElement/toDataURL，

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