图形界面有一个标签，一个文本框和一个按钮，编写程序实现点击按钮后，将文本框的内容取出，作为标签文本复制给标签。-Graphical interface has a label, a text box and a button, write a program to realize after clicking the button, remove the contents of a text box, as the label text copied to the label.