使用GetDisplayMedia获取单个屏幕截图，而无需提示用户

我正在构建一个在线应用程序，然后单击一个按钮，我希望能够筛选用户在浏览器中看到的内容(我的应用程序(。我已经看过许多JS库，例如HTML2Canvas，CCAPTURE是DOM-to-image，但是我的页面将混合使用HTML，SVG，Canvas和WebGL内容，而且我发现的所有解决方案似乎都无法完美捕获。

i然后遇到屏幕捕获API和getDisplayMedia。

我可以找到的所有示例始终询问您要共享的选项卡/应用程序/屏幕，然后具有所选页面的实时流。

理想情况下，我不希望用户执行其他操作，除了单击捕获按钮，它可以捕获用户启动该功能的页面的单个图像(数据URL(。然后，我可以在其他地方使用该数据。

任何建议都将不胜感激

从下面的url

下载示例

https://www.jqueryscript.net/other/capture-html-elements-screenshot.html

并用以下代码替换index.html

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <title>jQuery HTML Element Screenshot Example</title>
    <link href="https://www.jqueryscript.net/css/jquerysctipttop.css" rel="stylesheet" type="text/css">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <style>
        * {
            margin: 0;
            padding: 0;
        }
.container { margin: 150px auto; }
        .container > div {
            padding: 20px;
            border: 5px solid black;
        }
        h2 {
            margin: 10px auto;
        }
label { margin: 10px auto; }
        .toPic {
            display: none;
        }
    </style>
</head>
<body>
<div id="divTest">
    <div id="jquery-script-menu">
<div class="jquery-script-center">
<ul>
<li><a href="https://www.jqueryscript.net/other/Capture-HTML-Elements-Screenshot.html">Download This Plugin</a></li>
<li><a href="https://www.jqueryscript.net/">Back To jQueryScript.Net</a></li>
</ul>
<div class="jquery-script-clear"></div>
</div>
</div>
    <div class="container">
    <h1>jQuery HTML Element Screenshot Example</h1>
    <div style="background:red;width: 600px;" class="test">
        <div style="background:green;">
            <div style="background:blue;">
                <div style="background:yellow;">
                    <div style="background:orange;">
                        Element To Capture
                    </div>
                </div>    
            </div>    
        </div>
    </div>
    <h2 class="toCanvas"> <a href="javascript:void(0);" class="btn btn-danger"> To Canvas </a></h2>
    <h2 class="toPic"><a href="javascript:void(0);" class="btn btn-danger"> To Image </a></h2>
    <h5>
       <label for="imgW">Image Width:</label>
<input type="number" id="imgW" placeholder="Image Width" class="form-control" value="600">
<label for="imgH">Image Height:</label>
<input type="number" id="imgH" placeholder="Image Height" class="form-control" value="73">
<label for="imgFileName">File Name:</label>
<input type="text" value="a" placeholder="File Name" id="imgFileName" class="form-control">
<label for="sel">File Type:</label>
<select id="sel" class="form-control">
  <option value="png" selected>png</option>
  <option value="jpeg">jpeg</option>
  <option value="bmp">bmp</option>
</select>
<button id="save" class="btn btn-danger">Save And Download</button>
    </h5>
</div>
    <script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha384-tsQFqpEReu7ZLhBV2VZlAu7zcOV+rXbYlF2cqB8txI/8aZajjp4Bqd+V6D5IgvKT" crossorigin="anonymous"></script>
    <script type="text/javascript" src="html2canvas.min.js"></script>
    <script type="text/javascript" src="canvas2image.js"></script>
    <script type="text/javascript">
        var test = $("#divTest").get(0);
        // to canvas
$('.toCanvas').click(function(e) {
  html2canvas(test).then(function(canvas) {
    // canvas width
    var canvasWidth = $('#divTest').width();
    // canvas height
    var canvasHeight = $('#divTest').height();
    // render canvas
    $('.toCanvas').after(canvas);
    // show 'to image' button
    $('.toPic').show(1000);
    // convert canvas to image
    $('.toPic').click(function(e) {
      var img = Canvas2Image.convertToImage(canvas, canvasWidth, canvasHeight);
      // render image
      $(".toPic").after(img);
      // save
      $('#save').click(function(e) {
        let type = $('#sel').val(); // image type
        //let w = $('#imgW').val(); // image width
        //let h = $('#imgH').val(); // image height
        let w = canvasWidth; // image width
        let h = canvasHeight; // image height
        let f = $('#imgFileName').val(); // file name
        w = (w === '') ? canvasWidth : w;
        h = (h === '') ? canvasHeight : h;
        // save as image
        Canvas2Image.saveAsImage(canvas, w, h, type, f);
      });
    });
  });
});
    </script>
    </div>
</body>
</html>

并在浏览器中运行index.html。单击帆布按钮，然后单击"图像"按钮，最后单击下载。

，让我知道您是否正在寻找

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