fix: uni.canvasToTempFilePath在ios9.3.4报错的Bug

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

@@ -446,9 +446,10 @@ export default {
         }, this.$page.id)
         return
       }
-      if (!callbackId) {
+      if (!callbackId) {
+        // fix [...]展开TypedArray在低版本手机报错的问题，使用Array.prototype.slice
         return {
-          data: [...imgData.data],
+          data: Array.prototype.slice.call(imgData.data),
           width: destWidth,
           height: destHeight
         }