结果 

函数：

ui.Textbox(placeholder, value, onChange, disabled, style)

A textbox that enables the user to input text information.

Arguments:

placeholder (String, optional):

The placeholder text to display when the textbox is empty. Defaults to none.

value (String, optional):

The textbox's value. Defaults to none.

onChange (Function, optional):

The callback to fire when the text changes. The callback is passed the text currently in the textbox and the textbox widget.

disabled (Boolean, optional):