canvas: 增加变量类型

pages/component/canvas/canvas.uvue

@@ -13,16 +13,14 @@
     data() {
       return {
         title: 'Canvas',
-        drawing: null as any | null,
-        canvasElement: null as any | null,
-        canvasContext: null as any | null,
+        drawing: null as UniElement | null,
+        canvasElement: null as HTMLCanvasElement | null,
+        canvasContext: null as CanvasRenderingContext2D | null,
       }
     },
     onReady() {
-      this.drawing = this.$refs['drawing'] as any;
-      // @ts-ignore
-      this.canvasElement = document.createElement('canvas')
-      // @ts-ignore
+      this.drawing = this.$refs['drawing'] as UniElement;
+      this.canvasElement = document.createElement('canvas') as HTMLCanvasElement;
       this.canvasElement.className = 'canvas'
       this.drawing!.appendChild(this.canvasElement)
 
@@ -33,7 +31,7 @@
 </script>
 
 <style>
-  .drawing >>> .canvas {
+  .drawing>>>.canvas {
     width: 300px;
     height: 150px;
     margin-left: auto;