document.write('')
function?showloading()?
{
var?obj=document.getElementById("loadingg")
if?(obj.style.display!="")
{
obj.style.left=((document.documentElement.clientWidth-parseFloat?(obj.style.width))/2)+document.documentElement.scrollLeft+"px";
obj.style.top=((document.documentElement.clientHeight-parseFloat?(obj.style.height))/2)+document.documentElement.scrollTop+"px";
obj.style.display="";
}else{obj.style.display="none";}
}
function?$(id)
{????return?document.getElementById(id);????}
function?echo(obj,html){????$(obj).innerHTML=html;}
function?fopen(obj){$(obj).style.display="";}
function?fclose(obj){$(obj).style.display="none";}
function?createxmlhttp(){
????var?xmlhttp=false;
????try????{
??????????xmlhttp?=?new?ActiveXObject("Msxml2.XMLHTTP");
?????}?
????catch?(e)?{
??????????try?{
???????????????xmlhttp?=?new?ActiveXObject("Microsoft.XMLHTTP");
??????????}?
????????catch?(e)?{
???????????????xmlhttp?=?false;
?????????}
?????}
????if?(!xmlhttp?&&?typeof?XMLHttpRequest!='undefined')?{
??????????xmlhttp?=?new?XMLHttpRequest();
????????????????if?(xmlhttp.overrideMimeType)?{//設置MiME類別
????????????xmlhttp.overrideMimeType('text/xml');
????????}
????}????
????return?xmlhttp;????
}

function?getdata(url,obj1,obj2)
{????????var?xmlhttp=createxmlhttp();
????????if(!xmlhttp)
????????{alert("你的瀏覽器不支持XMLHTTP！！");
????????????return;
????????}
????????showloading()?
????????xmlhttp.onreadystatechange=requestdata;
????????xmlhttp.open("GET",url,true);
????????xmlhttp.send(null);
????????function?requestdata()
????????{????????fopen(obj1);
????????????????//echo(obj1,"正在加載數據，請稍等......");
????????????????//alert(xmlhttp.readyState)
????????????????if(xmlhttp.readyState==4)
????????????????{????if(xmlhttp.status==200)
????????????????????{????if(obj1!=obj2){fclose(obj1);};
????????????????????????echo(obj2,xmlhttp.responseText);
????????????????????????showloading()?
????????????????????}
????????????????}????????????
????????}
}
function?postdata(url,obj,data)
{???????var?rnd=Math.random()
????????var?xmlhttp=createxmlhttp();
????????if(!xmlhttp)
????????{
????????????alert("你的瀏覽器不支持XMLHTTP?。?);
????????????return;
????????}
????????showloading()?
????????xmlhttp.open("POST",?url,?true);
????????xmlhttp.onreadystatechange=requestdata;
????????xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
????????xmlhttp.send(data);
????????function?requestdata()
????????{????fopen(obj);
????????????echo(obj,"正在提交數據，請稍等......");
????????????if(xmlhttp.readyState==4)
????????????{????if(xmlhttp.status==200)
????????????????{
????????????????????echo(obj,xmlhttp.responseText);
????????????????????reget(rnd);
????????????????????setTimeout("echo('showresult','')",2000);
????????????????????echo('Message','')
????????????????????showloading()?
????????????????}
????????????}
????????}
}
function?lTrim(str)
{
??if?(str.charAt(0)?==?"?")
??{
????//如果字串左邊第一個字符為空格
????str?=?str.slice(1);//將空格從字串中去掉
????//這一句也可改成?str?=?str.substring(1,?str.length);
????str?=?lTrim(str);????//遞歸調用
??}
??return?str;
}

//去掉字串右邊的空格
function?rTrim(str)
{
??var?iLength;

??iLength?=?str.length;
??if?(str.charAt(iLength?-?1)?==?"?")
??{
????//如果字串右邊第一個字符為空格
????str?=?str.slice(0,?iLength?-?1);//將空格從字串中去掉
????//這一句也可改成?str?=?str.substring(0,?iLength?-?1);
????str?=?rTrim(str);????//遞歸調用
??}
??return?str;
}

//去掉字串兩邊的空格
function?trim(str)
{
??return?lTrim(rTrim(str));
}

function?f(obj)
{
????return?trim(eval("document.ajax_post."+obj+".value"));
????//return?trim($(obj).value);
}

function?SaveReply()
{????if(f("username")=="")
????{????alert("請填寫用戶名");
????????return?false;
????}
????if(f("Message")=="")
????{????alert("內容不可為空");
????????return?false;
????}
????var?validate,password,log_DisKey=0,log_DisURL=0,log_DisSM=0
????validate=""
????password=""
????if(document.ajax_post.log_DisKey.checked){
????????log_DisKey=f("log_DisKey")
????????}
????if(document.ajax_post.log_DisURL.checked){
????????log_DisURL=f("log_DisURL")
????????}
????if(document.ajax_post.log_DisSM.checked){
????????log_DisSM=f("log_DisSM")
????????}
????if((typeof?eval(document.ajax_post.validate))!="undefined"){
????????if(f("validate")=="")
????????{????alert("請填寫驗證碼");
????????????return?false;
????????}else{
????????????validate=f("validate");
????????}
????}????
????if((typeof?eval(document.ajax_post.password))!="undefined"){
????????password=f("password");
????}
????data="username="+escape(f("username"))+"&password="+escape(password)+"&validate="+escape(validate)+"&log_DisSM="+escape(log_DisSM)+"&log_DisURL="+escape(log_DisURL)+"&log_DisKey="+escape(log_DisKey)+"&Message="+escape(f("Message"))+"&logID="+escape(f("logID"))+"&action="+escape(f("action"));
????//alert(data);
????postdata("wbc_blogcomm.asp","showresult",data);
????return?true;
}

以上就是關于利用AJAX實現評論提交的示例，感謝大家的閱讀，更多內容請關注錯新技術頻道網站。