Ajax有时不起作用

I'm using Ajax in my web application, and here's my Ajax Jquery function :

$(".AlarmLink").click(function(){
            alert('ok');
            $(".page-content").empty();
            $("#alarm-loader").css('display','block');
            $.post($(this).attr("href"),                       
                       function(data){
                        var PageContent = $(data).find(".page-content");
                        $("#alarm-loader").css('display','none');
                        $(".page-content").append(PageContent.html());
                    });
            return false;
    });

and I call it from HTML link using the class="AlarmLink".

But the problem is that this works sometimes and sometimes not .

Try this. Probably you have elements added to page after listener is set.

$(document).ready(function(){
 $(document).on('click', '.AlarmLink', function() {
   alert('ok');
            $(".page-content").empty();
            $("#alarm-loader").css('display','block');
            $.post($(this).attr("href"),                       
                       function(data){
                        var PageContent = $(data).find(".page-content");
                        $("#alarm-loader").css('display','none');
                        $(".page-content").append(PageContent.html());
                    });
            return false;
  })
});

A few possible problems,

• Wrap it in a document ready event (if you do not already)
• Ensure you stop the link click ("I call it from HTML link") from occurring with e.preventDefault(), although I see your return false does that (and e.stopPropagation()) already. So you do not need both, just e.preventDefault(); or your return false.
• If the element may be changing dynamically, use a delgated version of on targetting the document, then filtering by your .AlarmLink selector (after the click occurs).

Putting all this together you get:

$(function(){
    $(document).on('click', ".AlarmLink", function(e){
            alert('ok');
            $(".page-content").empty();
            $("#alarm-loader").css('display','block');
            $.post($(this).attr("href"),                       
                       function(data){
                        var PageContent = $(data).find(".page-content");
                        $("#alarm-loader").css('display','none');
                        $(".page-content").append(PageContent.html());
                    });
            return false;
    });
});

Note:

A DOM ready handler is not required for a delegated event attached to document as document always exists, so you can reduce the example to:

$(document).on('click', ".AlarmLink", function(e){
        alert('ok');
        $(".page-content").empty();
        $("#alarm-loader").css('display','block');
        $.post($(this).attr("href"),                       
                   function(data){
                    var PageContent = $(data).find(".page-content");
                    $("#alarm-loader").css('display','none');
                    $(".page-content").append(PageContent.html());
                });
        return false;
});

Try this code, It will help you most probably

   $(function(){
    $(".AlarmLink").click(function(){
                alert('ok');
                $(".page-content").empty();
                $("#alarm-loader").css('display','block');
                $.post($(this).attr("href"),                       
                           function(data){
                            var PageContent = $(data).find(".page-content");
                            $("#alarm-loader").css('display','none');
                            $(".page-content").append(PageContent.html());
                        });
                return false;
        });
    });

$(document).ready(function(){

    $(".AlarmLink").live('click', function() {

        alert('ok');

        $(".page-content").empty();
        $("#alarm-loader").css('display','block');
        $.post($(this).attr("href"),                       
                   function(data){
                    var PageContent = $(data).find(".page-content");
                    $("#alarm-loader").css('display','none');
                    $(".page-content").append(PageContent.html());
                });
        return false;
    })
});