It would be tempting in this case to re-use the IDs teoma and yahoo later in the switch/case/toggle mechanism, but that will not work because those names refer to the instance data.
在本例后面的 switch/case/toggle 机制中重用 teoma 和 yahoo 这两个 ID 会是个不小的诱惑，但是由于它们的名称都引用了实例数据所以并不能正常运行。