?

function getUsernameInCookie() {
	var strcookie = document.cookie;
	var arrcookie = strcookie.split("; ");
	for ( var i = 0; i < arrcookie.length; i++) {
		var arr = arrcookie[i].split("=");
		if (arr[0] == 'userInfo' && arr[1] != undefined) {
			if (arr[1].split(escape(","))[0] == 'GoodBye') {
				return '';
			} else {
				return arr[1].split(escape(","))[0];
			}
		}
	}
	return '';
}


function delCookie() {
	var date = new Date();
	date.setTime(date.getTime() - 2 * 3600 * 1000 * 24);
	document.cookie = 'userInfo=GoodBye; expire=' + date.toGMTString();
}

function addCookie(name, value, expireHours) {
	var cookieString = name + "=" + escape(value);
	if (expireHours > 0) {
		var date = new Date();
		date.setTime(date.getTime + expireHours * 3600 * 1000 * 24);
		cookieString = cookieString + "; expire=" + date.toGMTString();
	}
	document.cookie = cookieString;
}

function logout() {
	delCookie();
	$('#UserInfo').html("Welcome&nbsp;&nbsp;&nbsp;&nbsp;guest&nbsp;");
	window.location.href = "user/logout.action";
	changeText();
}

?

?用户登陆后，通过js向浏览器中写入一个会话cookie，再登出时无论在ie8,还是chrome中都没问题。

?

因登陆的jsp中有这样的一段

?

$(document).ready(function() {

		document.onkeydown = keyDown;
		if (getUsernameInCookie() != '') {
			$('#UserInfo').html(
					"Welcome    " + getUsernameInCookie()
							+ "  |");
			changeText();
		}
		;
	});

?再加之用户注册激活后为增加用户体验，所以自动登陆，只能在后台（Action）中向客户端传入cookie：

?

		Cookie cookie = new Cookie("userInfo", DBusername);
		cookie.setPath("/");
		response.addCookie(cookie);

?如这样，在chrome中将cookie中的时间-1可以，但在ie8中用户名还是没办法清掉，就是这句：

?

?

	date.setTime(date.getTime() - 2 * 3600 * 1000 * 24);
	document.cookie = 'userInfo=; expire=' + date.toGMTString();

?

所以在最上面的js中加入了‘Goodbye’当标识符用。哎~~~

谁有好的方法欢迎拍砖！