slider-100: 移除 不必要的 "!"，因为已经使用了 as 语法

pages/component/slider-100/slider-100.uvue

@@ -45,16 +45,16 @@
         // this.sliderValue = value
 
         // TODO 跳过vue框架，直接修改原生组件
-        (this.$refs["slider1"]! as UniSliderElement[]).forEach((item) => {
+        (this.$refs["slider1"] as UniSliderElement[]).forEach((item) => {
           item.value = value
         });
-        (this.$refs["slider2"]! as UniSliderElement[]).forEach((item) => {
+        (this.$refs["slider2"] as UniSliderElement[]).forEach((item) => {
           item.value = value
         });
-        (this.$refs["slider3"]! as UniSliderElement[]).forEach((item) => {
+        (this.$refs["slider3"] as UniSliderElement[]).forEach((item) => {
           item.value = value
         });
-        (this.$refs["slider4"]! as UniSliderElement[]).forEach((item) => {
+        (this.$refs["slider4"] as UniSliderElement[]).forEach((item) => {
           item.value = value
         });
       }