php+mysql结合Ajax实现点赞功能完整实例
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//判断是否已经存在了cookie
function checkcookie(gindex){
var thiscookie = '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())
}
三、index.php页面:
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$num = $_GET['num'];
$aindex = $_GET['aindex'];
$con = mysql_connect("localhost","root","");
if (!$con){
die('Could not connect: ' . mysql_error());
}
mysql_select_db("goodplus", $con);
$sql0s = "SELECT * FROM `good` where `id` = ".$aindex;
$sql0 = mysql_query($sql0s);
if($_GET['flag'] == 0){
while($row = mysql_fetch_array($sql0)){
echo $row['value'];
}
}else if($_GET['flag'] == 1){
$sql="UPDATE `goodplus`.`good` SET `value` = '".$num."' WHERE `good`.`id` = ".$aindex;
if (!mysql_query($sql,$con)){
die('Error: ' . mysql_error());
}
echo $num;
}
mysql_close($con)
?>
四、最终的index.html页面如下:
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