cookie工具

//cookie工具
var CookieUtil = {
	//获取
	get: function (name){
		var cookieName = encodeURIComponent(name) + "=",
			cookieStart = document.cookie.indexOf(cookieName),
			cookieValue = null;
			
		if(cookieStart > -1){
			var cookieEnd = document.cookie.indexOf(";",cookieStart)
			if(cookieEnd == -1){
				var cookieEnd = document.cookie.length;
			}
			cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + 
				cookieName.length, cookieEnd));
		}
		return cookieValue;
	},
	
	//设置  expires:日期, path:路径, domain：域, secure=true 只能通过ssl链接
	set: function (name, value, expires, path, domain, secure) {
		var cookieText = encodeURIComponent(name) + "=" + 
			encodeURIComponent(value);
		
		if(expires instanceof Date){
			cookieText += ";expires=" + expires.toGMTString();
		}
		
		if(path) {
			cookieText += "; path=" + path;
		}
		
		if(secure){
			cookieText += "; secure";
		}
		
		document.cookie = cookieText;
	},
	//删除
	unset: function (name, path, domain, secure){
		this.set(name, "",new Date(0), path, domain, secure);
	}
};