js获取项目根路径

  //js获取项目根路径
    function getRootPath(){
        var curWwwPath=window.document.location.href;
        var pathName=window.document.location.pathname;
        var pos=curWwwPath.indexOf(pathName);
        var localhostPaht=curWwwPath.substring(0,pos);
        var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1);
        return(localhostPaht+projectName);
    }