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Implementation example of JS button color switching effect

黄舟
黄舟Original
2017-10-19 10:49:581713browse

This article mainly introduces the JS implementation of button color switching effect in detail, which has certain reference value. Interested friends can refer to it

The example in this article shares with you the implementation using parameter functions. The specific code for button color switching is for your reference. The specific content is as follows


<!DOCTYPE html> 
<html lang="en"> 
<head> 
  <meta charset="UTF-8"> 
  <title>Document</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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