jsの常用方法

//------------------        	
	function bytelength(szString) {
		return szString.replace(new RegExp("[^\x00-\xff]","g")," ").length;
	}



//------------------  span      
document.getElementById("isActiveShow"+id).style.display = "none";
document.getElementById("isActivedisplay"+id).style.display = "";


//------------------JavaScript           
<script type="text/javascript">
function document.onkeydown()                //         
{
        if(event.keyCode==13)    //     
        {
          if(document.activeElement.id=="rightform:textfield"){ //               ，     
                document.getElementById("rightform:button17").click();   // id jsf    id，html     
                return false;           
             }
        }
}
</script>

//-------------------    
<a href="javascript:window.external.AddFavorite(window.document.location,window.document.title)">     </a></span>


//-------------------       
//addCountry    
if (document.all) { //ie
	window.attachEvent("onload", addCountry);
} else { //ff
	window.addEventListener("load", addCountry, false);
}