wx.setTabBarItem({

index:0,

text: '设置忙时',

iconPath: '/image/busy_gray.png',

selectedIconPath: '/image/busy_green.png',

         success: function (res) {

              console.log('indexBarSuccess3', res)

          },

          fail: function (res) {

                console.log('indexBarFail3', res)

          },

           complete: function (res) {

                 console.log('indexBarComplete3', res)

           }

});

显示调用成功，在开发者工具上正常显示，在手机端（iPhone && Android）就是不显示。