fix: 调整示例兼容类型定义

pages/API/get-element-by-id/get-element-by-id-multiple-root-node.uvue

@@ -28,18 +28,18 @@
       },
       changePageHeadBackgroundColor() {
         const pageHead = uni.getElementById('page-head')!
-        pageHead.style['backgroundColor'] = 'red'
+        pageHead.style.setProperty('background-color', 'red')
       },
       changeTextColor() {
         const text = uni.getElementById('text')!
-        text.style['color'] = 'red'
+        text.style.setProperty('color', 'red')
       },
       changeViewStyle() {
         const view = uni.getElementById<UniViewElement>('view')
         if (view !== null) {
-          view.style['width'] = '90%'
-          view.style['height'] = '50px'
-          view.style['backgroundColor'] = '#007AFF'
+          view.style.setProperty('width', '90%')
+          view.style.setProperty('height', '50px')
+          view.style.setProperty('backgroundColor', '#007AFF')
         }
       }
     }

pages/API/get-element-by-id/get-element-by-id.uvue

@@ -35,18 +35,18 @@
       },
       changePageHeadBackgroundColor() {
         const pageHead = uni.getElementById('page-head')!
-        pageHead.style['backgroundColor'] = 'red'
+        pageHead.style.setProperty('background-color', 'red')
       },
       changeTextColor() {
         const text = uni.getElementById('text')!
-        text.style['color'] = 'red'
+        text.style.setProperty('color', 'red')
       },
       changeViewStyle() {
         const view = uni.getElementById<UniViewElement>('view')
         if (view !== null) {
-          view.style['width'] = '90%'
-          view.style['height'] = '50px'
-          view.style['backgroundColor'] = '#007AFF'
+          view.style.setProperty('width', '90%')
+          view.style.setProperty('height', '50px')
+          view.style.setProperty('background-color', '#007AFF')
         }
       },
       goMultipleRootNode() {