1. ajax_func.js的代碼如下 :
//定義XMLHttpRequest實例
var?http_request?=?false;
//定義可復用的http請求發送函數,初始化、指定處理函數、發送請求的函數
function?send_request(method,?url,?content,?responseType,?callback)?
{
????http_request?=?false;
????//開始初始化XMLHttpRequest對象
????if(window.XMLHttpRequest)?{
????????//Mozilla瀏覽器
????????http_request?=?new?XMLHttpRequest();
????????if(http_request.overrideMimeType)?{
????????????//設置MIME類別
????????????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，創建對象實例失敗
????????window.alert("不能創建XMLHttpRequest對象實例.");
????????return?false;
????}
????if(responseType.toLowerCase()?==?"text"?||?responseType.toLowerCase()?==?"xml")?{
????????http_request.onreadystatechange?=?callback;
????}??else?{
????????window.alert("響應類別參數錯誤.");
????????return?false;
????}
????//確定發送請求的方式和URL以及是否一步執行下段代碼
????if(method.toLowerCase()?==?"get")?{
????????http_request.open(method,?url,?true);
????}?else?if(method.toLowerCase()?==?"post")?{
????????http_request.open(method,?url,?true);
????????http_request.setRequestHeader("Content-Type",?"application/x-www-form-urlencoded");
????}?else?{
????????window.alert("http請求類別參數錯誤.");
????????return?false;
????}
????http_request.send(content);
}2. 回調函數舉例
1）處理返回文本格式信息的函數舉例（調用send_request方法時responseType為text）
function?processTextResponse()?{
????if(http_request.readyState?==?4)?{
????????if(http_request.status?==?200)?{
????????????//信息已經成功返回，開始處理信息
????????????alert("Text文檔相應.");
????????}?else?{
????????????alert("您所請求的頁面有異常.");
????????}
????}
} 2）處理返回格式信息的函數舉例（調用send_request方法時responseType為xml）
function?processXMLResponse()?...{
????if(http_request.readyState?==?4)?...{
????????if(http_request.status?==?200)?...{
????????????//信息已經成功返回，開始處理信息
????????????alert("XML響應.");
????????}?else?...{
????????????alert("您所請求的頁面有異常.");
????????}
????}
}
posted on 2007-02-11 23:26
阿蜜果 閱讀(2266)
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Ajax