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用户交互触发 2、触发事件不能再延时函数中   my colleagues and I found that iOS will only allow focus to be triggered on other elements,from within a function,if the first function in the call stack was triggered by a non-programmatic event. In your case,the call to setTimeout starts a new call stack,and the security mechanism kicks in to prevent you from setting focus on the input.     翻译：我和我的同事发现，iOS将只允许在其他元素上绑定函数来触发focus事件，如果第一个函数调用栈是由非编程触发的事件（这句不知道怎么翻译）。在你的案例中，调用setTimeout开始一个新的调用堆栈，IOS的安全机制开始阻止你触发input元素的focus事件ios下inputtextarea无法获取焦点的问题