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使用HTML截图并保存为本地图片的实现代码

时间:2019-08-06 16:23来源:脚本之家 作者:佚名 点击:
具体代码如下所示: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74

具体代码如下所示:
 

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<!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 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>

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