js操作Cookie，設置cookie讓全站所有頁面都有效

//設置cookie
function setCookie(name, value, liveMinutes) {  
	if (liveMinutes == undefined || liveMinutes == null) {
		liveMinutes = 60 * 2;
	}
	if (typeof (liveMinutes) != 'number') {
		liveMinutes = 60 * 2;//默認120分鐘
	}
	var minutes = liveMinutes * 60 * 1000;
	var exp = new Date();
	exp.setTime(exp.getTime() + minutes + 8 * 3600 * 1000);
	//path=/表示全站有效，而不是當前頁
	document.cookie = name + "=" + value + ";path=/;expires=" + exp.toUTCString();
}
//獲取cookie
function getCookie(cname) {
	var name = cname + "=";
	var ca = document.cookie.split(';');
	for (var i = 0; i < ca.length; i++) {
		var c = ca[i];
		while (c.charAt(0) == ' ')
			c = c.substring(1);
		if (c.indexOf(name) != -1)
			return c.substring(name.length, c.length);
	}
	return "";
};
//刪除cookies 
function delCookie(name) 
{ 
	 setCookie(name, 1, -1);
}