ajax 非同步請求

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<script type="text/javascript" >var http_request = false;function send_request(url){http_request = false;if(window.XMLHttpRequest){//Mozilla瀏覽器http_request = new  XMLHttpRequest();if(http_request.overrideMimeType){http_request.overrideMimeType("text/xml");}}else if(window.ActiveXObject){try{http_request = new ActiveXObject("Msxml2.XMLHTTP");}catch(e){try{http_request = new ActiveXObject("Microsoft.XMLHTTP");}catch(e){}}}if(!http_request){window.alert("不能建立XMLHttpRequest對象執行個體");return false;}http_request.onreadystatechange = processRequest;http_request.open("GET",url,true);http_request.send(null);}//處理返回資訊的函數function  processRequest(){if(http_request.readyState == 4){if(http_request.status == 200){alert(http_request.responseText);}else{alert("你請求的頁面有異常");}}}</script>