JS实现的按钮点击颜色切换功能示例

来源：意榕旅游网

本文实例讲述了JS实现的按钮点击颜色切换功能。分享给大家供大家参考，具体如下：

先来看看运行效果：

具体代码如下：

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>www.gxlcms.com 点击切换按钮颜色</title>
</head>
<body>
 <button id="btn1" onclick="btn(1)">按钮1</button>
 <button id="btn2" onclick="btn(2)">按钮2</button>
 <button id="btn3" onclick="btn(3)">按钮3</button>
 <script>
 //设置背景颜色
 //如果设置参数函数会节省函数数量吧
 //设置flag+参数函数
 flag = "btn1";
 function btn1(){
 document.getElementById("btn2").style.color = "black";
 document.getElementById("btn3").style.color = "black";
 document.getElementById("btn1").style.color = "red";
 }
 function btn2(){
 document.getElementById("btn1").style.color = "black";
 document.getElementById("btn2").style.color = "red";
 document.getElementById("btn3").style.color = "black";
 }
 function btn3(){
 document.getElementById("btn1").style.color = "black";
 document.getElementById("btn2").style.color = "black";
 document.getElementById("btn3").style.color = "red";
 }
 function btn(num){
 if(num == 1){
 document.getElementById(flag).style.color = "black";
 document.getElementById(flag).style.backgroundColor = "white";
 document.getElementById("btn1").style.color = "red";
 document.getElementById("btn1").style.backgroundColor = "blue";
 flag = "btn1";
 }
 if(num == 2){
 document.getElementById(flag).style.color = "black";
 document.getElementById(flag).style.backgroundColor = "white";
 document.getElementById("btn2").style.color = "red";
 document.getElementById("btn2").style.backgroundColor = "blue";
 flag = "btn2";
 }
 if(num == 3){
 document.getElementById(flag).style.color = "black";
 document.getElementById(flag).style.backgroundColor = "white";
 document.getElementById("btn3").style.color = "red";
 document.getElementById("btn3").style.backgroundColor = "blue";
 flag = "btn3";
 }
 }
 </script>
</body>
</html>

更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript切换特效与技巧总结》、《JavaScript遍历算法与技巧总结》、《JavaScript查找算法技巧总结》、《JavaScript错误与调试技巧总结》、《JavaScript数据结构与算法技巧总结》及《JavaScript数算用法总结》

希望本文所述对大家JavaScript程序设计有所帮助。