wx.hideTabBar is not a function

wx.hideTabBar is not a function;at pages/my/index page lifeCycleMethod onLoad function

TypeError: wx.hideTabBar is not a function

    at e.onLoad (http://127.0.0.1:63784/appservice/pages/my/index.js:23:8)

    at e.<anonymous> (http://127.0.0.1:63784/appservice/\_\_dev\_\_/WAService.js:13:30091)

    at I (http://127.0.0.1:63784/appservice/\_\_dev\_\_/WAService.js:13:17463)

    at L (http://127.0.0.1:63784/appservice/\_\_dev\_\_/WAService.js:13:19036)

    at U (http://127.0.0.1:63784/appservice/\_\_dev\_\_/WAService.js:13:19590)

    at Function.<anonymous> (http://127.0.0.1:63784/appservice/\_\_dev\_\_/WAService.js:13:21986)

    at http://127.0.0.1:63784/appservice/\_\_dev\_\_/WAService.js:13:27020

    at http://127.0.0.1:63784/appservice/\_\_dev\_\_/WAService.js:5:23804

    at Array.forEach (<anonymous>)

    at Function.<anonymous> (http://127.0.0.1:63784/appservice/\_\_dev\_\_/WAService.js:5:23784)