JS implementation code to obtain absolute path_javascript skills

In projects, we often need to get the absolute path of the project so that we can upload and download files. JS provides us with a method, although it requires a roundabout way. The code is as follows:

  function getRealPath(){
    //获取当前网址，如： http://localhost:8083/myproj/view/my.jsp
     var curWwwPath=window.document.location.href;
     //获取主机地址之后的目录，如： myproj/view/my.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：/myproj
    var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1);

　　 //得到了 http://localhost:8083/myproj
    var realPath=localhostPaht+projectName;
    alert(realPath);
  }