JavaScript进行简单的随即验证码生成（适合和我一样刚入门一本完整的教材书都没看完的弟弟）
16lz
2021-01-22
var checkcode = document.getElementById("code"); var btn = document.getElementById("btn"); var refresh = document.getElementById("refresh"); var code = ""; //生成随机的验证码
function setCode(){ code = ""; var length = 4; var array = [0,1,2,3,4,5,6,7,8,9,'Q','W','E','R','T','Y','U','I','O', 'P','A','S','D','F','G','H','J','K','L','Z','X','C','V','B','N','M']; for (var i = 0;i<length;i++){ let index = Math.floor(Math.random() * 36); code += array[index]; //Math.random()代表[0.0,1.0)这个区间的取值
// Math.floor()代表获取整数值(math.floor()向下取整，.ceil()向上取整，.round()执行标准取整（四舍五入）)
} checkcode.innerHTML = code; } setCode(); refresh.addEventListener("click",setCode,false);