Jquery on（'click'）在第一次点击后没有触发

I have some HTML:

我有一些HTML:

<div class="post-container self">
    <a href="/go.html?url=/user/Wiz">
        <img class="avatar" alt="Profile Picture" src="">
    </a>
    <div class="post-body">
        <div class="post" style="margin-left:0px;">
            <div class="post-timestamp" style="display:inline-block;float:right">
                <a href="/go.html?url=/posts/80" style="color:#999">Oct 31</a>
            </div>
            <div class="post-functions dropdown displaynone" style="float:right;margin-right:5px;">
                <a class="dropdown-toggle" data-toggle="dropdown" href="/go.html?url=javascript:void(0)">
                    <i class="icon-cog"> 
                    </i>
                </a>
                <ul class="dropdown-menu post-dropdown" role="menu" aria-labelledby="dLabel">
                    <a class="post-delete" href="/go.html?url=javascript:void(0)"><i class="icon-trash"> </i>Delete</a>
                </ul>
            </div>
        </div>
    </div>
</div>
<div class="pos