说明：  根据键盘触发的事件，以两种方式（拼音/汉字）自动补全文本想要输入的内容，并且探出下拉菜单显示匹配的内容，以供用户选择。本实例中只支持本分城市名称的自动补全。
(According to the keyboard to trigger events in two ways (Pinyin/Chinese characters) you want to automatically fill full-text input, and out the drop-down menu to match the content displayed for the user to choose. This instance the sub-city name only supports auto-completion.)