自己封装的常用javascript函数分享

都是些常用的功能，这里就不多废话了，小伙伴们自己看下就明白了

奉上代码：

代码如下:
//cookie
function setCookie(name, value, iDay)
{
    if(iDay!==false)
    {
        var oDate=new Date();
        oDate.setDate(oDate.getDate()+iDay);
        document.cookie=name+'='+value+';expires='+oDate+';path=/';
    }
    else
    {
        document.cookie=name+'='+value;
    }
}
function getCookie(name)
{
    var arr=document.cookie.split('; ');
    var i=0;
    for(i=0;i<arr.length;i++)
    {
        var arr2=arr[i].split('=');
        if(arr2[0]==name)
        {
            return arr2[1];
        }
    }
    return '';
}
function removeCookie(name)
{
    setCookie(name, 'a', -1);
}
//事件
function myAddEvent(obj, ev, fn){
    obj.attachEvent?obj.attachEvent('on'+ev, fn):obj.addEventListener(ev, fn, false);
}
function myDelEvent(obj, ev, fn){
    obj.detachEvent?obj.detachEvent('on'+ev, fn):obj.removeEventListener(ev, fn, false);
}
function getByClass(oParent, sClass)
{
    var aEle=oParent.getElementsByTagName('*');
    var re=new RegExp('//b'+sClass+'//b', 'i');
    var aResult=[];
    for(var i=0;i<aEle.length;i++)
    {
        if(re.test(aEle[i].className))
        {
            aResult.push(aEle[i]);
        }
    }
    return aResult;
}
function bindEvent(obj, ev, fn)
{
    obj.addEventListener?obj.addEventListener(ev, fn, false):obj.attachEvent('on'+ev, fn);
}
function unbindEvent(obj, ev, fn)
{
    obj.removeEventListener?obj.removeEventListener(ev, fn, false):obj.detachEvent('on'+ev, fn);
}
//生成随机数
function rnd(n, m)
{
    return Math.random()*(m-n)+n;
}
function time2date(t)
{
    function d(n){return n<10?'0'+n:''+n;}
    var oDate=new Date(t*1000);