在ajax调用后，$（this）为何未定义

你应该试试

$('.commentDeletelink').live('click', function(event) {    event.preventDefault();    var result = confirm('Proceed?');    var that = this;    if ( result ) {        $.ajax({ url: window.config.AJAX_REQUEST, type: "POST", data: { action       : 'DELCOMMENT',         comment      : $('#commentText').val(),         comment_id   : $(this).attr('href') }, success: function(result) {     alert($(that).attr('href'));     //$(that).fadeOut(slow); }        });    }});

因为

this

this

that