对某些ajax调用禁用BlockUI

var dontBlock = false;

$(document).ajaxStart(function(){
    if(!dontBlock)
        $.blockUI();
}).ajaxStop($.unblockUI);

// And in the ajax methods (to be excluded), set dontBlock accordingly

$('#autocomplete').keydown(function(){
    dontBlock = true;
    $.ajax({
        // url, data etc.
        success: function(){ dontBlock = false; }
    });
});

$.ajax({
        global: false,
        type: "POST",
        url: 'ajax/test.html',
        success: function(data) {
          $('.result').html(data);
          alert('Load was performed.');
        }
});