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

顶一下[5]

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;
    }
   }
  }
 }
}

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