代码如下：
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
{
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
{
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);
}