关于javascript:JS-video-获取视频第一帧

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<div class="websocket">
    <!--  poster="http://9haoguoji.oss-cn-beijing.aliyuncs.com/product/1619083692180048808.jpg" 设置 封面图 -->
    <video id="video1" style="background: #ccc" width="100%" controls="controls">
        <source src="123.mp4"  type="video/mp4">
    </video>
</div>

<script type="text/javascript">
    getVideoBase64('123.mp4')
    function getVideoBase64(url) {/* return new Promise(function(resolve, reject) {*/
            let dataURL = '';
            let video = document.createElement("video");
            video.setAttribute('crossOrigin', 'anonymous'); // 解决跨域
            video.setAttribute('src', url);
            video.setAttribute('width', 400);
            video.setAttribute('height', 240);
            video.addEventListener('loadeddata', function() {let canvas = document.createElement("canvas"),
                    width = video.width, //canvas 的尺寸和图片一样
                    height = video.height;
                canvas.width = width;
                canvas.height = height;
                canvas.getContext("2d").drawImage(video, 0, 0, width, height); // 绘制 canvas
                dataURL = canvas.toDataURL('image/jpeg'); // 转换为 base64
                $('#video1 source').attr('src', dataURL)
                //resolve(dataURL);
            });
        /*})*/
    }
</script>

本地能够线上会有跨域问题如果用的阿里服务器后盾勾销跨域

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