let pagePath ='/pages/MyMessenger/MyMessenger'
wx.setTabBarItem({
			index: 2,
			text: tabName,
			pagePath: pagePath,
			success:(res)=>{
				console.log('setTabBarItem success',res)
			},
			fail:(res)=>{
				console.log('setTabBarItem fail',res)
			},
			complete:()=>{
				wx.showTabBar();
			}
		});

 结果：setTabBarItem success {errMsg: "setTabBarItem:ok"}

tab,显示的文字改过来了，但跳转页还是原来设置的页？