JS Get absolute path

In the project, we often want to get the absolute path of the project, convenient for us to upload the download file, JS provides us with a method, although to detour. The code is as follows:

function Getrealpath () {
//Get the current URL such as: http://localhost:8083/myproj/view/my.jsp
var curwwwpath=window.document.location.href;
//Get the directory after the host address, such as:myproj/view/my.jsp
var pathname=window.document.location.pathname;
var pos=curwwwpath.indexof (pathName);
//Get host address, such as: http://localhost:8083
var localhostpaht=curwwwpath.substring (0,pos);
//Get the project name with "/", such as:/MyProj
var projectname=pathname.substring (0,pathname.substr (1). IndexOf ('/') +1);

//Got the Http://localhost:8083/myproj
var realpath=localhostpaht+projectname;
alert (realpath);
}

JS Get absolute path