base.js

function on(node,eventType,handler)
{
    //e=window.event||e;
   node=typeof node=="string"?document.getElementById(node):node;
   if(document.all) //IE
   {
      node.attachEvent("on"+eventType,handler);
   }
   else
   {
      node.addEventListener(eventType,handler,false);
   }
}
//on(btn,"click",function(){alert("1")});

1、trim()
function trim(ostr)
{
   return ostr.replace(/^s+|s+$/g,"");
}

2、isNumber、isString、isBoolean、isFunction、isNull、isUndefined、isEmpty、isArray
function isNumber(s)
{
   return !isNaN(s);
}

function isString(s)
{
  return typeof s==="string";
}

function isBoolean(s)
{
  return typeof s==="boolean";
}

function isFunction(s)
{
  return typeof s==="function";
}

function isNumm(s)
{
  return s===null;
}

function isUndefined(s)
{
  return typeof s==="undefined";
}

function isEmpty(s)
{ 
   return /^s*$/.test(s);
}

function isArray(s)
{
  return s instanceof Array;
}