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JS实现按钮点击颜色切换功能示例分享

小云云

发布： 2018-01-09 10:37:51

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3261人浏览过

本文主要介绍了js实现的按钮点击颜色切换功能,涉及js鼠标事件响应及页面元素属性动态操作相关实现技巧,需要的朋友可以参考下，希望能帮助到大家。

先来看看运行效果：

具体代码如下：

<!DOCTYPE html> 
<html> 
<head> 
  <meta charset="UTF-8"> 
  <title>www.jb51.net 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>

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