(function(){
//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);
})();