javascript import include 가져오기 데이터 형식 판단 함수

function isAlien(a)
{
return isObject(a) && typeof a.constructor != 'function';
} 


function isArray(a)
{
return isObject(a) && a.constructor == Array;
}

function isBoolean(a)
{
return typeof a == 'boolean';
}

function isEmpty(o)
{
var i, v;
if (isObject(o)) {
    for (i in o) {
      v = o[i];
      if (isUndefined(v) && isFunction(v)) {
        return false;
      }
    }
}
return true;
}

function isFunction(a)
{
return typeof a == 'function';
}

function isNull(a)
{
return typeof a == 'object' && !a;
}

function isNumber(a)
{
return typeof a == 'number' && isFinite(a);
}

function isObject(a)
{
return (a && typeof a == 'object') || isFunction(a);
}

function isString(a)
{
return typeof a == 'string';
}

function isUndefined(a)
{
return typeof a == 'undefined';
}
function $import(path,type,title)
{
var s,i;
if(type=="js")
{
   var ss=document.getElementsByTagName("script");
   for(i=0;i<ss.length;i++)
   {
    if(ss[i].src && ss[i].src.indexOf(path)!=-1)return;
   }
   s=document.createElement("script");
   s.type="text/javascript";
   s.src=path;
}
else if(type=="css")
{
   var ls=document.getElementsByTagName("link");
   for(i=0;i<ls.length;i++)
   {
    if(ls[i].href && ls[i].href.indexOf(path)!=-1)return;
   }
   s=document.createElement("link");
   s.rel="alternate stylesheet";
   s.type="text/css";
   s.href=path;
   s.title=title;
   s.disabled=false;
}
else return;
var head=document.getElementsByTagName("head")[0];
head.appendChild(s);
}