ajax php仿网易文章评论顶一下效果

ajax php教程仿网易文章评论顶一下效果

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js ajax

function setcookie(c_name,value,expiredays){ //设置cookie
var exdate=new date();
exdate.setdate(exdate.getdate()+expiredays);
document.cookie=c_name+ "=" +escape(value)+((expiredays==null) ? "" : ";expires="+exdate.togmtstring());
}

function createxmlhttprequest(){ //创建xmlhttprequest对象
if(window.activexobject){ //ie
try {
return new activexobject("microsoft.xmlhttp");
} catch(e){
return;
}
}else if(window.xmlhttprequest){ //mozilla,firefox
try {
return new xmlhttprequest();
} catch(e){
return;
}
}
}

function get_top_num(id){ //主调函数
var get_top_cookie=getcookie('get_top_'+id+'_cookie');
if(get_top_cookie!=null && get_top_cookie!=""){
alert('此条评论你已经支持过了');
}
else{
var xmlhttp=createxmlhttprequest();
var url = "action.php?action=top_num&id="+id;
if (id==""){
return false ;
}
if (xmlhttp){
callback = getreadystatehandler(xmlhttp,id);
xmlhttp.onreadystatechange = callback;
xmlhttp.open("get", url,true);
xmlhttp.send(null);
}
setcookie('get_top_'+id+'_cookie','istop',1);
}
}

function getreadystatehandler(xmlhttp,id){ //服务器返回后处理函数
var top_num = document.getelementbyid("top_num_"+id).innerhtml;
return function (){
if(xmlhttp.readystate == 4){
if(xmlhttp.status == 200){
if (xmlhttp.responsetext==1){
document.getelementbyid("top_num_"+id).innerhtml=number(top_num)+1;
}
}
}
}
}

//-->