一般的視頻網站對于用戶上傳的視頻，在用戶上傳完成后，可以對播放的視頻進行截圖，然后作為視頻的展示圖。項目中也可以引入這樣的功能給用戶一種不錯的體驗，而不是讓用戶額外上傳一張展示圖。
| _canvas = document.createElement("canvas"); _ctx = _canvas.getContext("2d"); _ctx.fillStyle = '#ffffff'; _ctx.fillRect(0, 0, _videoWidth, _videoWidth); _ctx.drawImage(_video, 0, 0, _videoWidth, _videoHeight, 0, 0, _videoWidth, _videoHeight); var dataUrl = _canvas.toDataURL("image/png"); |
核心代碼就這幾行，利用了ctx.drawImage時，第一個參數可以為video對象，然后就是通過canvas拿到DataUrl，賦值給Img標簽了。關鍵點就這些。
下面來看整個例子：
HTML:
| <!DOCTYPE html> <html> <head> <title></title> <meta charset="utf-8"> <style type="text/css"> html { overflow: hidden; } body { background-color: #999; } video { display: block; margin: 60px auto 0; } #shotBar { position: absolute; bottom: 5px; height: 120px; width: 98%; background-color: #000; box-shadow: -5px -5px 10px #fff; border-radius: 5px; padding: 2px; overflow: auto; } #shotBar img { border: 3px solid #fff; border-radius: 5px; height: 110px; width: 210px; margin-left: 4px; } </style> <script type="text/javascript" src="../../../jquery-1.8.3.js"></script> <script type="text/javascript" src="videoshot.js"></script> <script type="text/javascript"> $(function () { ZhangHongyang.click2shot.init(); }); </script> </head> <body> <video src="media/style.mp4" controls id="video"> </video> <div id="shotBar"> </div> </body> </html> |
html和css都是相當簡單的。
主要看Js的代碼:
| /** * Created with JetBrains WebStorm. * User: zhy * Date: 16-6-18 * Time: 上午12:24 * To change this template use File | Settings | File Templates. */ var ZhangHongyang = {}; ZhangHongyang.click2shot = (function () { var _ID_VIDEO = "video"; var _ID_SHOTBAR = "shotBar"; var _videoWidth = 0; var _videoHeight = 0; var _canvas = null; var _ctx = null; var _video = null; function _init() { _canvas = document.createElement("canvas"); _ctx = _canvas.getContext("2d"); _video = document.getElementById(_ID_VIDEO); _video.addEventListener("canplay", function () { _canvas.width = _videoWidth = _video.videoWidth; _canvas.height = _videoHeight = _video.videoHeight; console.log(_videoWidth + " , " + _videoHeight); _ctx.fillStyle = '#ffffff'; _ctx.fillRect(0, 0, _videoWidth, _videoWidth); $("#" + _ID_SHOTBAR).click(_click2shot); _video.removeEventListener("canplay", arguments.callee); }); } function _click2shot(event) { _video.pause(); _ctx.drawImage(_video, 0, 0, _videoWidth, _videoHeight, 0, 0, _videoWidth, _videoHeight); var dataUrl = _canvas.toDataURL("image/png"); //創建一個和video相同位置的圖片 var $imgBig = $("<img/>"); $imgBig.width(_videoWidth).height(_videoHeight).css({position: "absolute", left: _video.offsetLeft, top: _video.offsetTop, width: _videoWidth + "px", height: _videoWidth + "px"}).attr("src", dataUrl); $("body").append($imgBig); //創建縮略圖，準備加到shotBar var $img = $("<img>"); $img.attr("src", dataUrl); $(this).append($img); var offset = _getOffset($img[0]); $img.hide(); //添加動畫效果 $imgBig.animate({left: offset.x + "px", top: offset.y + "px", width: $img.width() + "px", height: $img.height() + "px"}, 200, function () { $img.attr("src", dataUrl).show(); $imgBig.remove(); _video.play(); }); } /** * 獲取元素在顯示區域的leftOffset和topOffset * @param elem * @returns {{x: (Number|number), y: (Number|number)}} * @private */ function _getOffset(elem) { var pos = {x: elem.offsetLeft, y: elem.offsetTop}; var offsetParent = elem.offsetParent; while (offsetParent) { pos.x += offsetParent.offsetLeft; pos.y += offsetParent.offsetTop; offsetParent = offsetParent.offsetParent; } return pos; } return {init: _init} })(); |
