编写一个应用程序，要求鼠标的光标始终指向一个字符串的起始位置，随着鼠标的移动，字符串跟随移动，而且字符串的颜色在整个字符串中实现渐变。-Write an application, requiring the mouse cursor always points to the starting position of a string, the string to follow the move as the mouse moves, and string color of the entire string gradient.