'&otherParam=' + this.data.otherParam

pages/welcome/welcome.js

@@ -431,7 +431,7 @@ Page({
                             wx.reLaunch({
                                 url: '../../pages/home-page/home-page?loginType=' 
                                 + this.data.loginType
-                                + '&otherParam=' + this.data.otherParam,
+                                + (this.data.otherParam?'&otherParam=' + this.data.otherParam:''),
                             })
                         }
                     }