javascript 获取项目根路径

    /**
     * http://localhost:8088/projectName
     */
    function getRootPath(){
        //获取当前网址，如： http://localhost:8088/projectName/index.jsp
        var curWwwPath = window.document.location.href;
        //获取主机地址之后的目录，如： projectName/index.jsp
        var pathName = window.document.location.pathname;
        var pos = curWwwPath.indexOf(pathName);
        //获取主机地址，如： http://localhost:8088
        var localhostPath = curWwwPath.substring(0, pos);
        //获取带"/"的项目名，如：/projectName
        var projectName = pathName.substring(0, pathName.substr(1).indexOf('/')+1);
        return(localhostPath + projectName);
    }