https://developers.weixin.qq.com/miniprogram/dev/framework/app-service/route.html#%E9%99%84%E6%B3%A8

附注表格倒数第三行，不应该触发 C.onUnload()

| D | tabB | D.onUnload(), C.onUnload(), tabB.onLoad(), tabB.onShow() |