在renderjs中取到的dom 内没有方法

const downloader = new Downloader()  
                    const parser = new Parser()  
                    console.log(document.getElementById('myCanvas'))  
                    console.log(document.getElementById('myCanvas').append)  
                    const player1 = new Player(document.getElementById('myCanvas'))  

                    let fileData1 = await downloader.get('./login.svga')

输出下面

11:37:03.929 App Launch at App.vue:4
11:37:03.949 App Show at App.vue:8
11:37:05.036 [object HTMLElement] at pages/login/login.vue:17 at app-view.js:384
11:37:05.057 undefined at pages/login/login.vue:18 at app-view.js:384
11:37:05.077 Uncaught (in promise) Error: container should be HTMLCanvasElement. at static/svga.min.js:168