js 操作cookie

var jsoncode=(function(){
　　　　/*setCookie：设置一个cookie
	*	
	*/
	this.setCookie=function (name,value){
		var Days = 30; //此 cookie 将被保存 30 天
		var exp = new Date();
		exp.setTime(exp.getTime() + Days*24*60*60*1000);
		document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();
	}
	
	/*	delCookie：删除一个cookie
	*	
	*/
	this.delCookie=function (name){
		var exp = new Date();
		exp.setTime(exp.getTime() - 1);
		var cval=getCookie(name);
		if(cval!=null) document.cookie= name + "="+cval+";expires="+exp.toGMTString();
	}

	/*	getCookie：读取cookie
	*	
	*/
	this.getCookie=function (name){
		var arr = document.cookie.match(new RegExp("(^| )"+name+"=([^;]*)(;|$)"));
		if(arr != null)
		return unescape(arr[2]);
		return null;
	}
　　
　　　　　　　　　return this;
})(jsoncode);
window.jsoncode=jsoncode;