ajax公用代码备份

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做ajax的时候经常用的公用代码在此备份：
ajax.js

function newXMLHttpRequest() {
    var reqHttp;
    if (window.ActiveXObject) {    // IE
        try {
            reqHttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {
            try {
                reqHttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e1) {
                reqHttp = null;
            }
        }
    } else if (window.XMLHttpRequest){ // IE ??
        try {
            reqHttp = new XMLHttpRequest();
        } catch (e) {
            reqHttp = null;
        }
    }
    if (reqHttp == null) errorMessage();   //XMLHttpRequest ?? ??
    return reqHttp;
}

function errorMessage() {
    alert("error");
}

function openSendStatus(getPost, urlFileAppl, trueFalse, sendData, flag) {
    var xmlHttp = newXMLHttpRequest();
       xmlHttp.open(getPost, urlFileAppl, trueFalse);
    xmlHttp.onreadystatechange = function() {
        if (xmlHttp.readyState == 4) {
            if (xmlHttp.status == 200) {
                mainControl(xmlHttp, flag);
            } else {
                exceptionControl(xmlHttp);
            }
        }
    }
    var conType = "application/x-www-form-urlencoded; charset=UTF-8";
    xmlHttp.setRequestHeader("Content-Type", conType);
    xmlHttp.send(sendData);
}

function exceptionControl(xmlHttp) {
    var exceptShow = "error code: " + xmlHttp.status;
    exceptShow += ", closed";
    alert(exceptShow);
}

应用实例：

function mainControl(xmlHttp) {
                    var sourceData = decodeURIComponent(xmlHttp.responseText);
                    var setdata = eval("("+sourceData+")");
                    if(setdata==false){
                      alert("The notice title has been existed!/n please reset title!");
                      MAIN_FORM.NOTICE_TITLE.value = "";
                      MAIN_FORM.NOTICE_TITLE.focus();
                      return ;
                    }
                }

              function validateNotice(){
                    var hidden_name = MAIN_FORM.hidden_name.value;
                    var idx_id = MAIN_FORM.IDXID.value;
                    var notice_name = MAIN_FORM.NOTICE_TITLE.value;
                    if(hidden_name!=notice_name){
                        var getPost = "POST";
                        var urlFileAppl = "ES0116_02_Action.jsp";
                        var trueFalse = true;
                        var sendData = "idx_id=" + idx_id+"&ACTION=VALIDATE&notice_name="+notice_name;
                        openSendStatus(getPost, urlFileAppl, trueFalse, sendData);
                    }
              }

仅供个人使用参考