js获取项目根目录路径

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    //js获取项目根路径,如: http://localhost:8083/uimcardprj  
    function getRootPath(){  
        //获取当前网址,如: http://localhost:8083/uimcardprj/share/meun.jsp  
        var curWwwPath=window.document.location.href;  
        //获取主机地址之后的目录,如: uimcardprj/share/meun.jsp  
        var pathName=window.document.location.pathname;  
        var pos=curWwwPath.indexOf(pathName);  
        //获取主机地址,如: http://localhost:8083  
        var localhostPaht=curWwwPath.substring(0,pos);  
        //获取带"/"的项目名,如:/uimcardprj  
        var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1);  
        return(localhostPaht+projectName);  
    }