---

components/city-change/index.js

@@ -220,42 +220,47 @@ Component({
     // }
     //开始触摸事件
     touchStart: function (e) {
-      console.log('开始')
-
+      this.data.touchEndy = e.touches[0].pageY-this.data.topHeight;
     },
     touchMove: function (e) {
       this.data.touchEndy = e.touches[0].pageY-this.data.topHeight;
       var lindex = parseInt(this.data.touchEndy / this.data.rightheight * 26);//根据前面分析获取手指触摸位置在letters中的index值
       var value = this.data.letter[lindex];
-      console.log(value)
-      this.setData({
-        cityListId: value
-      });
+      if(value){
+        this.setData({
+          cityListId: value
+        });
+      }
       this.titleDialog(value)
 
     },
     touchEnd: function (e) {
-      console.log('结束')
       var lindex = parseInt(this.data.touchEndy / this.data.rightheight * 26);//根据前面分析获取手指触摸位置在letters中的index值
       var value = this.data.letter[lindex];
-      this.setData({
-        cityListId: value
-      });
-      console.log(value)
+      if(value){
+        this.setData({
+          cityListId: value
+        });
+      }
+     
       this.titleDialog(value)
 
     },
     titleDialog: function (value) {
-      this.setData({
-        dialongValue:value,
-        dialogIsShow:true
-      })
-      setTimeout(() => {
+      if(value){
         this.setData({
-          dialongValue:null,
-          dialogIsShow:false
+          dialongValue:value,
+          dialogIsShow:true
         })
-      }, 1500);
+        setTimeout(() => {
+          this.setData({
+            dialongValue:null,
+            dialogIsShow:false
+          })
+        }, 1500);
+      }
+
+
     },
   },
   ready() {