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JavaScript点击按钮生成4位随机验证码

网络编程 2021-07-04 14:07www.168986.cn编程入门
这篇文章主要为大家详细介绍了JavaScript点击按钮生成4位随机验证码，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

本文实例为大家分享了js实现点击按钮生成4位随机验证码的具体代码，供大家参考，具体内容如下

效果图

代码

<!DOCTYPE html>
<html lang="en">
 
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>Document</title>
 <style>
 div {
  width: 100px;
  height: 50px;
  background: red;
  text-align: center;
  line-height: 50px;
 }
 </style>
</head>
 
<body>
 <div id="yzm"></div>
 <button id="btn">点击生成验证码</button>
 <script>
 // var str = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
 //数组转换为字符串
 // var arr = str.split("");
 
 var arr = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"];
 // console.log(arr);
 //页面刚加载时候调用它
 sjs(arr);
 
 btn.onclick = function() {
  sjs(arr);
 }
 
 function sjs(arr) {
  var code = Math.floor(Math.random()  arr.length);
  var code1 = Math.floor(Math.random()  arr.length);
  var code2 = Math.floor(Math.random()  arr.length);
  var code3 = Math.floor(Math.random()  arr.length);
  var n = arr[code] + arr[code1] + arr[code2] + arr[code3];
  yzm.innerHTML = n
 }
 </script>
</body>
 
</html>

长沙网络推广再为大家分享一段代码点击产生四位随机数字母与数字

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>点击产生随机数</title>
  <style>
  span{
    display: block;
    width: 110px;
    height: 50px;
    border: 1px solid red;
    text-align: center;
    line-height: 50px;
  }
  </style>
</head>
<body>
  <span id="demo" onclick="init();"></span>
  <script>
    init();
    function init(){
    var arr=[];
    for(var i=48;i<123;i++){
     if(i>57 && i<65) continue;
     if(i>90 && i<97) continue;
     arr.push(String.fromCharCode(i));
    }
    arr.sort(function () {
     return Math.random()-0.5;
    });
    arr.length=4;
    
    var span= document.getElementById('demo');
    span.textContent=(arr.join(""));
        }
  
  </script>
</body>
</html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持狼蚁SEO。

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