js获取web的root path

function getRootPath(){
    //获取当前网址,如: http://localhost:8090/jobservice/service/meun.jsp
var curWwwPath=window.document.location.href;
//获取主机地址之后的目录,如: jobservice/service/menu.jsp
var pathName=window.document.location.pathname;
var pos=curWwwPath.indexOf(pathName);
//获取主机地址,如: http://localhost:8090
var localhostPaht=curWwwPath.substring(0,pos);
//获取带"/"的项目名,如:/jobservice
var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1);
return(localhostPaht+projectName);
}

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