php+xml结合Ajax实现点赞功能完整实例

); var num; var flag = 0;

for(var i = 1; i < span.length + 1; i++){
senddata(i);
}

function goodplus(gindeX){
flag = 1;
num = parseInt(span.item(gindeX).innerHTML);
if(checkcookie(gindeX) == truE){
num = num + 1;
senddata(gindeX);
}else{
alert("你已经点过赞咯！")
}
}

function senddata(aindeX){
var xmlhttp;
var txt;
if(window.XMLhttprequest){
xmlhttp=new XMLhttprequest();
}else{
xmlhttp=new ActiveXObject("Microsoft.XMLhttp");
}
xmlhttp.onreadystatechange=function(){
if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
if(flag == 0){
xmldoc = xmlhttp.responseXML;
var count = xmldoc.getElementsByTagName('count');
var span2 = document.getElementsByTagName('span');
for(var j = 0; j < count.length; j++){
span2.item(j).innerHTML = count[j].childNodes[0].nodeValue;
}
}else if(flag == 1){
xmldoc2 = xmlhttp.responseText;
var span3 = document.getElementsByTagName('span');
span3.item(aindeX).innerHTML = xmldoc2;
}
}
}
if(flag == 0){
xmlhttp.open("GET","/ajax/foodmap/index.xml");
}else{
xmlhttp.open("GET","/ajax/foodmap/index.php?num=" + num + "&aindex=" + aindex,truE);
}
xmlhttp.send();
}

//判断是否已经存在了cookie
function checkcookie(gindeX){
var thiscookie = 'sdcity_foodmap_goodplus' + gindex;
var mapcookie = getCookie(thiscookiE)
if (mapcookie!=null && mapcookie!=""){
return false;
}else {
setCookie(thiscookie,thiscookie,365);
return true;
}
}

//获取cookie
function getCookie(c_Name){
//获取cookie，参数是名称。
if (document.cookie.length > 0){
//当cookie不为空的时候就开始查找名称
c_start = document.cookie.indexOf(c_name + "=");
if (c_start != -1){
//如果开始的位置不为-1就是找到了、找到了之后就要确定结束的位置
c_start = c_start + c_name.length + 1 ;
//cookie的值存在名称和等号的后面，所以内容的开始位置应该是加上长度和1
c_end = document.cookie.indexOf(";",c_start);
if (c_end == -1) {
c_end = document.cookie.length;
}
return unescape(document.cookie.subString(c_start,c_end));
//返回内容，解码。
}
}
return "";
}

//设置cookie
function setCookie(c_name,value,expiredays){
//存入名称，值，有效期。有效期到期事件是今天+有效天数。然后存储cookie，
var exdate=new Date();
exdate.setDate( exdate.getDate() + expiredays )
document.cookie = c_name + "=" + escape(value) + ((expiredays==null) ? "" : "; expires=" + exdate.toGMTString())
}

php;"> load('index.xml'); $goodnode=$dom->getElementsByTagName('goodnode'); $goodnode = $goodnode->item($aindeX); $items = $goodnode->getElementsByTagName('count'); foreach($items as $a){ $a->nodeValue = $_GET['num']; } $dom->save('index.xml'); ?>