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在 post.php中 ：

//$UserOption will be Yes/No for button clicks or empty string for first load of the page

$UserOption = $_REQUEST['UserClicked'];

//Id will be set if a vote has been clicked or empty string if it's the first load
$Id = $_REQUEST['Id'];

//(Do something with $UserOption)

$sql = mysql_query("SELECT * FROM posts WHERE active ='0' LIMIT 1") or die (mysql_error());
$row = mysql_fetch_array($sql);
echo $row['sitepost'];

JS ：

<script type="text/javascript">
$(document).ready(function(){
   update(null,null);
})

function update(Id, Vote) {
    $(".post-body").eq(0).load("post.php?UserClicked=" + Vote + "&Id=" + Id);
}
</script>

HTML ：

<div class="post-body"></div>


<button type="button" onclick="update(1, 'Yes');">Yes</button>
<button type="button" onclick="update(1, 'No');">No</button>



<button type="button" onclick="update(2, 'Yes');">Yes</button>
<button type="button" onclick="update(2, 'No');">No</button>

备用HTML / JS

<script type="text/javascript">
$(document).ready(function(){
    $("#yes").click(function(){
        update('Yes');
    })
    $("#no").click(function(){
        update('No');
    })
    update();
})

function update(Vote) {
    $(".post-body").eq(0).load("post.php?UserClicked=" + Vote);
}
</script>

<div class="post-body"></div>
<button id="yes" type="button">Yes</button>
<button id="no" type="button">No</button>