/*限制autocomplete 高度,超出显示滚动条*/
.ui-autocomplete {
    max-height: 180px;
    overflow-y: auto;
    /* prevent horizontal scrollbar */
    overflow-x: hidden;
  }
  /* IE 6 doesn't support max-height
   * we use height instead, but this forces the menu to always be this tall
   */
  * html .ui-autocomplete {
    height: 180px;
  }