来自chinaz的ajax获取评论代码

ajax获取到的字符是类似下面的内容
复制代码 代码如下:
{a:"支持：[ 0 ]    反对：[ 0 ]中国站长站网友：匿名 于 2008-04-25 评论道：谁认为投放了Google AdSense的站点就不允许进行推广了？傻子吧",b:1}

然后用下面的ajax进行输出
复制代码 代码如下:

var key='';
var str=new Array();

function createAjaxObj(){
    var httprequest=false
    //document.domain='chinaz.com';
    if (window.XMLHttpRequest){ // if Mozilla, Safari etc
        httprequest=new XMLHttpRequest()
        if (httprequest.overrideMimeType)
            httprequest.overrideMimeType('text/xml');
    }
    else if (window.ActiveXObject){ // if IE
        try 
        {
            httprequest=new ActiveXObject("Msxml2.XMLHTTP");
        } 
        catch (e)
        {
            try
            {
                httprequest=new ActiveXObject("Microsoft.XMLHTTP");
            }
            catch (e){}
        }
    }
    return httprequest;
}

function load_feedback(arcID,pg){



    var xmlhttp = createAjaxObj();
    try
    {

        var params="action=show&arcID="+arcID+"&pg="+pg;
        xmlhttp.abort();    

        xmlhttp.open("get","/plus/feedback_ajax.php?"+params,true);

        xmlhttp.setRequestHeader("Content-type", "text/html;charset=gb2312");    

        xmlhttp.setRequestHeader("If-Modified-Since","0");    

        xmlhttp.setRequestHeader("Content-length", params.length);

        xmlhttp.setRequestHeader("Connection", "close");

        xmlhttp.onreadystatechange=f

        xmlhttp.send(null);    

    }catch(ex){}
    function f()
    {

            if(xmlhttp.readyState!= 4 || xmlhttp.status!=200 )
                return ;
            var b= xmlhttp.responseText;
            var obj = eval("("+b+")");          
            document.getElementById('fedbk').innerHTML=obj.a;
            document.getElementById('fedcount').innerHTML=obj.b;
            document.getElementById('feedcounttop').innerHTML=obj.b;
    }
}


function load_allfeedback(arcID,pg){

    var xmlhttp = createAjaxObj();
    try
    {

        var params="action=showall&arcID="+arcID+"&pg="+pg;
        xmlhttp.abort();    

        xmlhttp.open("get","/plus/feedback_ajax.php?"+params,true);

        xmlhttp.setRequestHeader("Content-type", "text/html;charset=gb2312");    

        xmlhttp.setRequestHeader("If-Modified-Since","0");    

        xmlhttp.setRequestHeader("Content-length", params.length);

        xmlhttp.setRequestHeader("Connection", "close");

        xmlhttp.onreadystatechange=f

        xmlhttp.send(null);    

    }catch(ex){}
    function f()
    {

            if(xmlhttp.readyState!= 4 || xmlhttp.status!=200 )
                return ;
            var content= xmlhttp.responseText;
            var obj = eval("("+content+")");      
           // eval('var obj = ' + content);    
            document.getElementById('fedbk').innerHTML=obj.a;
            //document.getElementById('fedcount').innerHTML=obj.b;
    }
}

function feed_back(){

    var msg   = trim(document.getElementById('msg').value);
    var arcID = document.getElementById('arcID').value;
    var username = trim(document.getElementById('username').value);
    var pwd   = trim(document.getElementById('pwd').value);
    var checkbox = document.getElementById('notuser');
    if(checkbox.checked)
        var notuser = 1;
    else
        var notuser = 0;    


    var xmlhttp = createAjaxObj();
    try
    {

        params="action=send&arcID="+arcID+"&msg="+msg+"&username="+username
                +"&pwd="+pwd+"¬user="+notuser;

        xmlhttp.abort();    

        xmlhttp.open("get","/plus/feedback_ajax.php?"+params,true);

        xmlhttp.setRequestHeader("Content-type", "text/html;charset=gb2312");    

        xmlhttp.setRequestHeader("If-Modified-Since","0");    

        xmlhttp.setRequestHeader("Content-length", params.length);

        xmlhttp.setRequestHeader("Connection", "close");

        xmlhttp.onreadystatechange=f

        xmlhttp.send(null);    

    }catch(ex){}
    function f()
    {    
            if(xmlhttp.readyState!= 4 || xmlhttp.status!=200 )
                return ;
                var arr = xmlhttp.responseText.split("@:");

                if(!arr[1]){
                    alert(xmlhttp.responseText);
                }
                else{    
                    if(arr[0] != 'true')
                        alert(arr[0]);
                    alert(arr[2]);
                    ck_yzimg();    
                    load_feedback(arr[1],1);
                }
    }

}

function goodbad(fid,arcid,actname,pg){

    
    var xmlhttp = createAjaxObj();

    try
    {
        params = "action="+actname+"&fid="+fid+"&arcID="+arcid+"&pg="+pg;

        xmlhttp.abort();    

        xmlhttp.open("get","/plus/feedback_ajax.php?"+params,true);

        xmlhttp.setRequestHeader("Content-type", "text/html;charset=gb2312");    

        xmlhttp.setRequestHeader("If-Modified-Since","0");    

        xmlhttp.setRequestHeader("Content-length", params.length);

        xmlhttp.setRequestHeader("Connection", "close");

        xmlhttp.onreadystatechange=f

        xmlhttp.send(null);    

    }catch(ex){}
    function f()
    {    
            if(xmlhttp.readyState!= 4 || xmlhttp.status!=200 )
                return ;
                var arr = xmlhttp.responseText.split("@:");

                if(!arr[1])
                    alert(xmlhttp.responseText);
                else{    
                    alert(arr[0]);
                    load_feedback(arr[1],arr[2]);
                }
    }

}

function goodbad2(fid,arcid,actname,pg){

    
    var xmlhttp = createAjaxObj();

    try
    {
        params = "action="+actname+"&fid="+fid+"&arcID="+arcid+"&pg="+pg;

        xmlhttp.abort();    

        xmlhttp.open("get","/plus/feedback_ajax.php?"+params,true);

        xmlhttp.setRequestHeader("Content-type", "text/html;charset=gb2312");    

        xmlhttp.setRequestHeader("If-Modified-Since","0");    

        xmlhttp.setRequestHeader("Content-length", params.length);

        xmlhttp.setRequestHeader("Connection", "close");

        xmlhttp.onreadystatechange=f

        xmlhttp.send(null);    

    }catch(ex){}
    function f()
    {    
            if(xmlhttp.readyState!= 4 || xmlhttp.status!=200 )
                return ;
                var arr = xmlhttp.responseText.split("@:");

                if(!arr[1])
                    alert(xmlhttp.responseText);
                else{    
                    alert(arr[0]);
                    load_allfeedback(arr[1],arr[2]);
                }
    }

}

function pg(vl){
    var arcID = document.getElementById('arcID').value;
    load_feedback(arcID,vl);
}
function pg2(arcID,vl){
    //var arcID = document.getElementById('arcID').value;
    load_allfeedback(arcID,vl);
}
function ck_yzimg(){
    //document.all.cknum.value='';
    document.all.msg.value='';
    document.all.username.value='';
    document.all.pwd.value='';
    document.getElementsByName('sb')[0].disabled = false;
    //document.all.img1.onclick();
}

function trim(s) {
 return s.replace( /^s*/, "" ).replace( /s*$/, "" );

}

//////


核心代码
复制代码 代码如下:
           var b= xmlhttp.responseText; 
            var obj = eval("("+b+")");           
            document.getElementById('fedbk').innerHTML=obj.a; 
            document.getElementById('fedcount').innerHTML=obj.b; 
            document.getElementById('feedcounttop').innerHTML=obj.b;