JS中制作红绿灯的代码？

JavaScript021

JS中制作红绿灯的代码？,第1张

只能修改页面统一代码中的颜色设置: a:hover { color: #FFFFFFtext-decoration: none} a:visited { color: #ffftext-decoration: none}

//按回车键就可以

import java.awt.event.KeyAdapter

import java.awt.event.KeyEvent

import javax.swing.JFrame

import javax.swing.JLabel

public class Print {

public static void main(String[] args) {

JFrame jFrame = new JFrame ()

final JLabel jLabel = new JLabel ("按回车键！")

jFrame.setLayout(null)

jLabel.setBounds(80,50,500,80)

jFrame.add(jLabel)

jFrame.setSize(200, 200)

jFrame.setLocation(200, 300)

jFrame.setVisible(true)

jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

jFrame.addKeyListener(new KeyAdapter () {

int n = 0

public void keyPressed(KeyEvent e) {

int keyCode = e.getKeyCode()

if (keyCode == KeyEvent.VK_ENTER) {

n++

if (n == 1)

jLabel.setText("绿")

else if (n == 2) {

jLabel.setText("红")

} else if (n == 3) {

jLabel.setText("黄")

n = 0

}

}

}

})

}

}