删除无用的browser-canvas

pages/template/browser-canvas/browser-canvas.uvue

-<template>
-  <view>
-    <page-head :title="title"></page-head>
-    <view class="page-body">
-      <!-- 如何使用浏览器内置 canvas -->
-      <view ref="drawing" class="drawing"></view>
-    </view>
-  </view>
-</template>
-
-<script>
-  export default {
-    data() {
-      return {
-        title: '浏览器 canvas',
-        drawing: null as HTMLElement | null,
-        canvasElement: null as HTMLCanvasElement | null,
-        canvasContext: null as CanvasRenderingContext2D | null,
-      }
-    },
-    onReady() {
-      this.drawing = this.$refs['drawing'] as HTMLElement;
-      this.canvasElement = document.createElement('canvas') as HTMLCanvasElement;
-      this.canvasElement!.className = 'canvas'
-      this.drawing!.appendChild(this.canvasElement)
-
-      this.canvasContext = this.canvasElement!.getContext('2d')
-      this.canvasContext!.fillRect(100, 50, 100, 50)
-    }
-  }
-</script>
-
-<style>
-  .drawing>>>.canvas {
-    width: 300px;
-    height: 150px;
-    margin-left: auto;
-    margin-right: auto;
-    border: 1px dashed #000;
-  }
-</style>