VB入门。设计一个“Hello World”程序，单击“Hello”、“Color”、“Clear”按钮可以实现相应的操作。单击“Hello”按钮显示标签文字“”及文本框文字“”，并将文字颜色置为黑色；单击“Color”按钮会随机改变标签文字颜色及文本框文字颜色；单击“Clear”按钮清除标签文字及文本框文字，并将“Color”按钮置为不活动。-VB started. Design a " Hello World"　program, click the " Hello" , " Color" , " Clear"　button to achieve the appropriate action. Click the " Hello"　button to display the label text " ,"　text box and the text " " , and the text color is set to black　click the " Color"　button will randomly change the label text color and text color of the text box　click the " Clear"　button Clear label text and text box text and " Color"　button to set as inactive.