在Chrome的控制台运行即可

function CreatePassword(length) {
    var password = '';
    var charlist = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    for(var i = 0; i < length; i++) {
        password += charlist.charAt(parseInt(Math.random()*charlist.length));
    }
    return password;
}