refactor(element-draw): 优化 element 非空断言

pages/API/element-draw/element-draw.uvue

@@ -17,7 +17,7 @@
   <!-- #endif -->
 </template>
 
-<script>
+<script lang="uts">
   var y = 160
   export default {
     data() {
@@ -57,9 +57,9 @@
     },
     methods: {
       drawText() {
-        let element = uni.getElementById('draw-text-view')
-        let ctx = element!.getDrawableContext()
-        let width = element!.getBoundingClientRect().width
+        let element = uni.getElementById('draw-text-view')!
+        let ctx = element.getDrawableContext()
+        let width = element.getBoundingClientRect().width
         ctx!.reset()
         ctx!.font = "15px"
         ctx!.textAlign = "center"