修复登录bug

@@ -431,14 +431,14 @@ redirectAction: function() {
   let that = this;
   if (that.data.h5back) {
     wx.navigateBack({
-      delta: 1,
+      delta: 2,
     })
     wx.redirectTo({
       url: '../webview/webview?url=' + that.data.h5back
     })
   } else {
     wx.navigateBack({
-      delta: 1,
+      delta: 2,
     })
     return
   }