fix: canvas 触发 resize 导致延迟绘图时canvas变化 fixed #2847

src/core/view/components/canvas/index.vue

@@ -133,12 +133,13 @@ export default {
         method(data)
       }
     },
-    _resize () {
+    _resize (size) {
       var canvas = this.$refs.canvas
+      var hasChanged = !size || (canvas.width !== size.width * pixelRatio || canvas.height !== size.height * pixelRatio)
       if (canvas.width > 0 && canvas.height > 0) {
         var context = canvas.getContext('2d')
         var imageData = context.getImageData(0, 0, canvas.width, canvas.height)
-        wrapper(canvas)
+        hasChanged && wrapper(canvas)
         context.putImageData(imageData, 0, 0)
       } else {
         wrapper(canvas)