七郎's JavaBlog

<script language="javascript">
 var http_request = false;
 function send_request(url) {//初始化、指定處理函數(shù)、發(fā)送請(qǐng)求的函數(shù)
  http_request = false;
  //開(kāi)始初始化XMLHttpRequest對(duì)象
  if(window.XMLHttpRequest) { //Mozilla 瀏覽器
   http_request = new XMLHttpRequest();
   if (http_request.overrideMimeType) {//設(shè)置MiME類(lèi)別
    http_request.overrideMimeType('text/xml');
   }
  }
  else if (window.ActiveXObject) { // IE瀏覽器
   try {
    http_request = new ActiveXObject("Msxml2.XMLHTTP");
   } catch (e) {
    try {
     http_request = new ActiveXObject("Microsoft.XMLHTTP");
    } catch (e) {}
   }
  }
  if (!http_request) { // 異常，創(chuàng)建對(duì)象實(shí)例失敗
   window.alert("不能創(chuàng)建XMLHttpRequest對(duì)象實(shí)例.");
   return false;
  }
  //http_request.onreadystatechange = processRequest;
  // 確定發(fā)送請(qǐng)求的方式和URL以及是否同步執(zhí)行下段代碼
  http_request.open("post","http://localhost/test/SaveServlet", true);//請(qǐng)求方式，路徑，是否同異步
  http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
  http_request.send("printNum=aa&docID=bb");//需要傳的參數(shù)

 }
 // 處理返回信息的函數(shù)
    /*function processRequest() {
        if (http_request.readyState == 4) { // 判斷對(duì)象狀態(tài)
            if (http_request.status == 200) { // 信息已經(jīng)成功返回，開(kāi)始處理信息
                alert(http_request.responseText);
            } else { //頁(yè)面不正常
                alert("您所請(qǐng)求的頁(yè)面有異常。");
            }
        }
    }*/
 function userCheck() { //應(yīng)用中調(diào)用此方法就會(huì)執(zhí)行上面的異步方法 
   send_request('aaa');  
 }
</script>