ajax 入門執行個體教程

function init_ajax()
{
 var ajax=false;
 try{
   ajax = new ActiveXObject("Msxml2.XMLHTTP");
 }catch(e){
    try {
      ajax = new ActiveXObject("Microsoft.XMLHTTP");
    }catch(E){
      ajax = false;
    }
  }
  if (!ajax && typeof XMLHttpRequest!='undefined') {
    ajax = new XMLHttpRequest();
  }
  return ajax;
}
function get_menu()
{
 var url = "ajax_pages.php?act=menus";
 var show = document.getElementById("menu");
 show.innerHTML = "資料轉送中....請稍候....";
 var ajax = init_ajax();
 ajax.open("GET", url, true);
 ajax.onreadystatechange = function(){
  if (ajax.readyState == 4 && ajax.status == 200){
   show.innerHTML = ajax.responseText;
  }
 }
 ajax.send(null);
}