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JS implementation of button click color switching function example sharing

小云云Original: 2018-01-09 10:37:512918browse

This article mainly introduces the button click color switching function implemented by JS, involving js mouse event response and dynamic operation of page element attributes related implementation techniques. Friends in need can refer to it, I hope it can help everyone.

Let’s take a look at the running effect first:

##The specific code is as follows:

<!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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