jquery ui autocomplete:如何在文本输入失去焦点后取消缓慢的ajax请求

$(function() {
  var input = $("#input");
  var cancel = null;

  input.autocomplete({
    source: function(request, response) {
      if (cancel) {
        cancel.abort();
      }

      var xhr = $.ajax({
        url: "your-ajax-url",
        dataType: "json",
        data: {
          term: request.term
        },
        success: function(data) {
          response(data);
        }
      });

      cancel = xhr;
    },
    minLength: 2,
    select: function(event, ui) {
      // 处理选择事件
    }
  });

  input.blur(function() {
    if (cancel) {
      cancel.abort();
    }
  });
});