js cookie相关操作

1. 设置cookie

/**
*  设置cookies
*@param string cname表示key
*@param string cvalue表示value
*@param number exdays 表示过期时间（exdays天后过期）
*/
function setCookie(cname, cvalue, exdays) {
	var expires = "";
	if(typeof exdays !== "undefined"){
		var d = new Date();
		d.setTime(d.getTime() + exdays * 24 * 60 * 60 * 1000);
		expires = "expires" + d.toUTCString();
	}
	document.cookie = cname + "=" + encodeURIComponent(cvalue) + "; " + expires + "; path =" + "/";
}

2. 获取cookie

/**
*获取cookie，取不到返回空字符串
*@param string cname表示key
*/
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) == 0) return decodeURIComponent(c.substring(name.length, c.length)); 
	}
	return "";
}