js获得文件根目录

function getRootPath(){

                //获取当前网址，如： http://localhost:8083/proj/meun.jsp

                var curWwwPath = window.document.location.href;

                //获取主机地址之后的目录，如： proj/meun.jsp

                var pathName = window.document.location.pathname;

                var pos = curWwwPath.indexOf(pathName);

                //获取主机地址，如： http://localhost:8083

                var localhostPath = curWwwPath.substring(0, pos);

                //获取带"/"的项目名，如：/proj

                var projectName = pathName.substring(0, pathName.substr(1).indexOf('/')+1);

                return(localhostPath + projectName);

            }