//獲取當前網址，如： http://localhost:8080/Tmall/index.jsp
var curWwwPath=window.document.location.href;

//獲取主機地址之后的目錄如：/Tmall/index.jsp
var pathName=window.document.location.pathname;
var pos=curWwwPath.indexOf(pathName);

//獲取主機地址，如： http://localhost:8080
var localhostPaht=curWwwPath.substring(0,pos);

//獲取帶"/"的項目名，如：/Tmall
var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1);