cookie在网页中存储用户信息

1. 设置cookie的函数

function setCookie(name, value, days) {
	if(days) {
		var date = new Date();
		date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
		var expires = "; expires=" + date.toGMTString();
	} else expires = "";
	document.cookie = name + "=" + value + expires + "; path=/";
}

2. 获取cookie的函数

function getCookie(name) {
	var nameEQ = name + "=";
	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, c.length);
		if(c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
	}
	return "";
}

3. 使用

if(getCookie("lang")==''){

    // 设置lang=cn(有效期为7天)
	setCookie("lang","cn",7);
}