js生成随机密码，密码位数自定

话不多说，上代码 

function pb(size){
    var seed = ['A','B','C','D','E','F','G','H','I','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','m','n','p','Q','r','s','t','u','v','w','x','y','z','2','3','4','5','6','7','8','9'];// 密码源数组
    var n='';                     
    for(var i=0;i<size;i++){
        t=Math.round(Math.random()*(seed.length-1));
        n+=seed[t];
    }            
    return n;
}
document.write(pb(8));