H5调取摄像头摄像上传的两种方式_u-upload怎么选择调用相机?-优快云博客

转自大神文章，链接：https://blog.youkuaiyun.com/przlovecsdn/article/details/82256413
<!DOCTYPE html>
<html>
 
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>H5 Upload</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        
        .upload {
            position: relative;
            margin: 0 auto;
            width: 100%;
        }
        
        .upload button {
            display: block;
            width: 100%;
            height: 50px;
            background-color: orange;
            border: none;
        }
        
        .upload input {
            position: absolute;
            left: 0;
            top: 0;
            display: block;
            width: 100%;
            height: 50px;
            opacity: 0;
        }
        
        .upload img {
            margin: 0 auto;
            display: block;
            width: 100%;
        }
    </style>
</head>
 
<body>
    <div class="upload">
        <button>上传文件(base64)</button>
        <input type="file" accept="video/*" capture="camcorder" id="upload">
    </div>
    <div class="upload">
        <button>上传文件(二进制)</button>
        <input type="file" accept="video/*" capture="camcorder" id="upload1">
    </div>
    <script>
        var upload = {
            init: function() {
                this.event();
            },
            event: function() {
                var _this = this;
                // 方式一：采用FileReader方式
                document.getElementById('upload').addEventListener('change', function(event) {
                        var that = this;
                        var file = event.target.files[0];
                        var reader = new FileReader();
                        reader.onload = function(e) { //文件读取成功完成时触发
                            var video = document.createElement('video');
                            video.setAttribute('controls', true)
                            video.src = this.result; //this.result为base64文件路径
                            _this.insertAfter(video, that);
                        }
                        reader.readAsDataURL(this.files[0]); // 读出 base64
                    })
                    // 方式二：采用二进制形式
                document.getElementById('upload1').addEventListener('change', function(e) {
                    var that = this;
                    var file = e.target.files[0];
                    var blob = new Blob([file]), // 文件转化成二进制文件
                        url = URL.createObjectURL(blob); //转化成url
                    var video = document.createElement('video');
                    video.setAttribute('controls', true);
                    video.setAttribute('src', url);
                    _this.insertAfter(video, that);
                    video.onload = function(e) {
                        URL.revokeObjectURL(this.src); // 释放createObjectURL创建的对象
                    }
                })
            },
            insertAfter: function(newElement, targetElement) {
                var parent = targetElement.parentNode;
                if (parent.lastChild == targetElement) {
                    // 如果最后的节点是目标元素，则直接添加。因为默认是最后
                    parent.appendChild(newElement);
                } else {
                    parent.insertBefore(newElement, targetElement.nextSibling);
                    //如果不是，则插入在目标元素的下一个兄弟节点 的前面。也就是目标元素的后面
                }
            }
        }
 
        upload.init();
    </script>
</body>
 
</html>