JavaScript登录验证码的实现

废话不多说,实现js登录验证码的功能需要下面两步,具体实现过程如下所示: 1.js var code="" ; //在全局 定义验证码 function createCode(){ code = ""; var codeLength = 6;//验证码的长度 var checkCode = document.getElementById("checkCode"); checkCode.value = ""; var selectChar = new Array(0,1,2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M