JS获取项目根路径

function getRoot() {
     var curWwwPathName = window.document.location.href;
     var pathName = window.document.location.pathname;
     var pos = curWwwPathName.indexOf(pathName);
     var localhostPath = curWwwPathName.substring(0, pos);
     var projectName = pathName.substring(0, pathName.substring(1).indexOf("/") + 1);
     return localhostPath + projectName;
}