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  • 使用html2canvas.js将HTML生成图片

    <!DOCTYPE html>
    <html lang="en">
    
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <script src="../script/jquery-1.9.1.min.js"></script>
        <script src="../script/html2canvas.js"></script>
        <style type="text/css">
            .divBody {
                position: absolute;
                 100%;
                height: 100%;
                background: url(../images/bg.jpg) no-repeat center top;
                background-size: 100% 100%;
                font-family: "黑体";
                color: #292929;
                letter-spacing: 2px;
                z-index: 1000;
            }
    
            .divInfo {
                 76%;
                margin-left: 12%;
                position: relative;
                top: 25%;
                text-align: center;
            }
            #btnDown{
                position:absolute;
                top:15px;
                right:10px;
                z-index:1000;
                cursor: pointer;
            }
    
        </style>
    </head>
    
    <body>
        <div id="divBody" class="divBody">
            <div class="divInfo" id="divInfo">
                <h1>剑来语录</h1>
                <div>
                    <p>我住人间万古宅,大日高升在墙东。</p>
                    <p>睁眼便觉扰清梦,敕令明月坠其中。</p>
                    <p>天上仙佛三百万,遇我也须称上神。</p>
                    <p>醉乘白鹿驾青虬,列仙遇我求醇酒。</p>
                    <p>挂冠天宫桂枝上,手抓金乌做炭笼。</p>
                    <p>悲哉仙人千秋梦,一梦见我误长生。</p>
                </div>
            </div>
        </div>
        <div id="btnDown">
            <img src="../images/share.png" style="2rem;height:2rem;" />
        </div>
    </body>
    
    </html>
    <script type="text/javascript">
        $(function () {
            $("#btnDown").click(function () {
                downPNG("下载图片.png", "divBody");
            });
        });
    
        function downPNG(pngName, pngId) {
            var scaleBy = getDPR();//获取像素比
    
            var canvas = document.createElement('canvas');// 创建自定义 canvas 元素
            // 设定 canvas 元素属性宽高为 DOM 节点宽高 * 像素比
            var width = document.getElementById(pngId).clientWidth;
            var height = document.getElementById(pngId).clientHeight;
    
            canvas.width = width * 2;
            canvas.height = height * 2;
    
            var context = canvas.getContext('2d');
            // 将所有绘制内容放大像素比倍
            context.scale(2, 2);
            var rect = document.getElementById(pngId).getBoundingClientRect(); //获取元素相对于视察的偏移量
            context.translate(-rect.left, -rect.top); //设置context位置,值为相对于视窗的偏移量负值,让图片复位
    
            html2canvas(document.getElementById(pngId), {
                canvas,
                dpi: 300,
                scale: 1,
                useCORS: true, //(图片跨域相关)
                allowTaint: false, //允许跨域(图片跨域相关)
                onrendered: function (imgCanvas) {
                    var imgData = imgCanvas.toDataURL('image/octet-stream');
                    if (imgCanvas.msToBlob) { // IE 9+浏览器
                        var blob = imgCanvas.msToBlob();
                        window.navigator.msSaveBlob(blob, pngName);
                    } else {
                        saveFile(imgData, pngName);
                    }
                }
            });
        }
    
        function saveFile(data, filename) {
            
            //微信浏览器不能直接下载图片,需要展示一张图片长按下载...        
            if (is_weixn()) {
                //方法一
                var img = document.createElement('img');
                img.src = data;
                img.style.width = "100%";
                $("#divBody").html(img);
    
                //方法二
                // var html = "<img src ='" + data + "' style='100%;height:100%' />";
                // $("#divBody").html(html);
    
                $("#btnDown").hide();//隐藏分享按钮
    
                alert("图片生成成功,长按保存图片!");//提示用户长按下载图片
            } else {
                console.log(1);
                //直接下载图片
                var save_link = document.createElement('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);
            }
            
    
            
    
            
        };
    
        function getDPR() {
            if (window.devicePixelRatio && window.devicePixelRatio > 1) {
                return window.devicePixelRatio;
            }
            return 2;
        }
    
        function is_weixn() {
            var ua = navigator.userAgent.toLowerCase();
            if (ua.match(/MicroMessenger/i) == "micromessenger") {
                return true;
            } else {
                return false;
            }
        }
    
    </script>
    

      

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  • 原文地址:https://www.cnblogs.com/xy0710/p/15109998.html
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