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);  
    }