回到顶部按钮及动画--fix3

@CONTROL/移动端多项数据控件/CONTROL-BASE.template.ftl

@@ -169,7 +169,7 @@
             </ion-list>
         </#if>
             <div class="no-data" v-if="items.length == 0">暂无数据</div>
-            <div class="scrollToTop" @click="scrollToTop" ref="scroll"> <van-icon name="back-top" /></div>            
+            <div class="scrollToTop" @click="scrollToTop" ref="scroll" v-show="isEnableScrollTop && showScrollButton"> <van-icon name="back-top" /></div>            
         </div>
     </div>
 </template>
\ No newline at end of file

@CONTROL/移动端多项数据控件/CONTROL-BASE.vue.ftl

@@ -885,7 +885,10 @@
         }, false)
         list.addEventListener('scroll', (e:any) => {
           if (scroll && list) {
-            scroll.style.opacity = list.scrollTop * 0.001;
+            if (list.scrollTop >= 500) {
+              this.showScrollButton = true;
+            }
+            scroll.style.opacity = (list.scrollTop-200) * 0.001;
           }
         }, false)
       }
@@ -1102,6 +1105,22 @@
 
     }
 
+    /**
+     * 是否开启置顶功能
+     *
+     * @type {GlobalUiService}
+     * @memberof ${srfclassname('${ctrl.codeName}')}Base
+     */
+    public isEnableScrollTop:boolean = true;
+
+    /**
+     * 显示置顶按钮
+     *
+     * @type {GlobalUiService}
+     * @memberof ${srfclassname('${ctrl.codeName}')}Base
+     */
+    public showScrollButton:boolean = false;
+
     /**
      * 滑回顶部
      *