</a>
这个是js部分
获取关注人数的内容，字符串转换整型，获得当前关注人数
tot=$('.tot').html();
tot=parseInt(tot);
var x;
$('.guan').click(function(){
//获取当前关注标签的class ，判断以后分别关注跟取消关注
//我这个是一个课程网站的关注 需要携带课程id
xx=$(this).find('b').attr('class');
//未关注则进行关注
if(xx=='guanzhu_start'){
$.post("{:U('guan')}",{'courseid':courseid},function(r){
根据后面的php函数function guan()操作数据库，当关注成功是返回1；前台获取到1以后给当前关注人数加1；
if(r==1){
if(x){
$('.tot').html((x+1)+"人");
x=x+1;
}else{
$('.tot').html((tot+1)+"人");
x=tot+1;
}
}
});
//已关注就取消关注
根据后面的php函数function qu()操作数据库，当取消关注成功是返回1；前台获取到1以后给当前关注人数减1；
}else if(xx=='guanzhu_down'){
$.post("{:U('qu')}",{'courseid':courseid},function(r){
if(r==1){
if(x){
$('.tot').html((x-1)+"人");
x=x-1;
}else{
$('.tot').html((tot-1)+"人");
x=tot-1;
}
}
)};
public function guan(){
$courseid=$_POST['courseid'];//从前台获取的课程id
$userid=$_SESSION['userid'];//$_SESSION中获取用户id
$time=time();
$obj=M();
增加关注
$sql="insert into weixin_follow (userid,courseid,time) values('$userid','$courseid','$time')";
$row=$obj->execute($sql);
if($row){
查询原来课程关注数并加一
$sql1="selec focuse from weixin_course_class wher cid='$courseid'";
$focuse=$obj->query($sql1);
$focuse=$focuse[0][focuse];
$tot=$focuse+1;
$sql2="updat weixin_course_class set focuse='$tot' wher cid='$courseid'";
$ftot=$obj->execute($sql2);
echo 1;
}
}
public function qu(){
$courseid=$_POST['courseid'];//从前台获取的课程id
$userid=$_SESSION['userid'];//$_SESSION中获取用户id
$obj=M();
取消增加关注
$sql="delet from weixin_follow wher userid='$userid' and courseid='$courseid'";
$row=$obj->execute($sql);
if($row){
查询原来课程关注数并减一
$sql1="selec focuse from weixin_course_class wher cid='$courseid'";
$focuse=$obj->query($sql1);
$focuse=$focuse[0][focuse];
$tot=$focuse-1;
$sql2="updat weixin_course_class set focuse='$tot' wher cid='$courseid'";
$ftot=$obj->execute($sql2);
echo 1;
}
}
