js生成随机字符串功能

// 获取长度为len的随机字符串function _getRandomString(len) {    len = len || 32;    var $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678'; // 默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1    var maxPos = $chars.length;    var pwd = '';    for (i = 0; i < len; i++) {        pwd += $chars.charAt(Math.floor(Math.random() * maxPos));    }    return pwd;}

方法参考phpMyAdmin 首页 -> Change Password -> Generate password 功能，如下图