fix: 优化 slider 组件鼠标指针效果

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

 <template>
-  <uni-slider
-    ref="uni-slider"
-    v-on="$listeners"
+  <uni-slider
+    ref="uni-slider"
+    v-on="$listeners"
     @click="_onClick">
     <div class="uni-slider-wrapper">
       <div class="uni-slider-tap-area">
-        <div
-          :style="setBgColor"
+        <div
+          :style="setBgColor"
           class="uni-slider-handle-wrapper">
-          <div
-            ref="uni-slider-handle"
-            :style="setBlockBg"
+          <div
+            ref="uni-slider-handle"
+            :style="setBlockBg"
             class="uni-slider-handle" />
-          <div
-            :style="setBlockStyle"
+          <div
+            :style="setBlockStyle"
             class="uni-slider-thumb" />
-          <div
-            :style="setActiveColor"
+          <div
+            :style="setActiveColor"
             class="uni-slider-track" />
         </div>
       </div>
-      <span
-        v-show="showValue"
+      <span
+        v-show="showValue"
         class="uni-slider-value">{{ sliderValue }}</span>
     </div>
     <slot />
@@ -259,6 +259,7 @@ export default {
 		margin-left: -14px;
 		background-color: transparent;
 		z-index: 3;
+		cursor: grab;
 	}
 
 	uni-slider .uni-slider-thumb {
@@ -288,4 +289,4 @@ export default {
 		background-color: #FFF;
 		border-color: #ccc;
 	}
-</style>
+</style>