截取啊。
//window.location.href="http://ip/b.jsp?returnURL=http://ip/a.jsp";
var url="http://ip/b.jsp?returnURL=http://ip/a.jsp";
alert(url.match("returnURL=(.*)")[1]);
//window.location.href="http://ip/b.jsp?returnURL=http://ip/a.jsp";
var url="http://ip/b.jsp?returnURL=http://ip/a.jsp";
alert(url.match("returnURL=(.*)")[1]);
${param.returnURL }这不知道里面什么数据。