生成随机字符串

代码：

//生成随机字符串
function randomString(len) {
    len = len || 32;
    /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
    var $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';    
    var maxLen = $chars.length;
    var str = '';
    for (i = 0; i < len; i++) {
        str += $chars.charAt(Math.floor(Math.random() * maxLen));
    }
    return str;
}

示例：

var $res=randomString(8);
console.log($res);//Pnm5yAtz

var $res=randomString(0);
或者var $res=randomString();
console.log($res);//DQyfD3XxZdzwXEpsQyzPjE2GSGnxnkGN