use*_*278 5 javascript get-display-media
我正在构建一个在线应用程序，单击按钮后我希望能够截取用户在浏览器（我的应用程序）中看到的内容。我已经查看了很多 js 库，例如 html2canvas、CCapture 作为 dom-to-image，但我的页面将混合有 html、svg、canvas 和 webgl 内容，而且我找到的解决方案似乎都无法完美捕获它。
然后我遇到了Screen Capture API和 getDisplayMedia。
我能找到的所有示例总是询问您想要共享哪个选项卡/应用程序/屏幕，然后对您选择的页面进行实时流传输。
理想情况下，除了单击捕获按钮并捕获用户启动该功能的页面的单个图像（数据 url）之外，我不希望用户执行任何其他操作。然后我可以在其他地方使用该 dataurl。
任何建议将不胜感激
小智 -5
从下面的网址下载示例
https://www.jqueryscript.net/other/Capture-HTML-Elements-Screenshot.html
并将index.html替换为以下代码
<!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“到画布”按钮，然后单击“到图像”按钮，最后单击“下载”。
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