JavaScript How to get the project root path

Use JavaScript code to get the address of the root of the project:

Complete code:

//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);
}

I just want to get the host address:

			//js获取项目根路径
			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);
				return(localhostPaht);
			}

OK