Use JavaScript to create random verification codes for web pages
1: getCode.js
/** * 产生随机数的函数 */function validateCode(n){ //验证码可能包含的字符
var s="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
var ret=""; //用于保存生成的验证码 //利用循环,随机产生生成验证码的每一个字符
for(var i=0;i<n;i++) {
var index = Math.floor(Math.random() * 62); //随机产生一个0~62之间的数字
ret += s.charAt(index);//将随机产生的数字当作字符串的位置下标,在字符串s中取出该字符，并加入到ret中 }
return ret; //返回产生的验证码}/* 显示随机数的函数 */function show() {
document.getElementById("msg").innerHTML=validateCode(4);//在id为msg的对象显示验证码}window.onload=show();//在整个页面加载完成后执行此函数2:checkCode.html
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>制作网页随机验证码</title> <script type="text/javascript" src="getCode.js"></script></head><body> <span id="msg"></span> <input type="button" value="刷新" onclick="show()"></body></html>
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