/**
 *  : ʹ js ʵ include 
 *      ʾ <script src="tool.js" include="head.html"></script>
 *      src λýű, include Ըýű.htmlļ
 * ע :
 *      űUIʹ
 *      Ϊ˷, Ҫʹjs
 *      chrome صʱ --allow-file-access-from-files 
 *  : Edgar.lee
 */