javascript设置和获取cookie的方法

设置cookie
document.cookie="name="+value;

//获取cookie其中index是cookie的名称
    function getCookie(index){
    	var allcookies = document.cookie;  
    	var cookie_pos = allcookies.indexOf(index);
    	if (cookie_pos != -1){
    		cookie_pos += index.length + 1;
    		var cookie_end = allcookies.indexOf(";",cookie_pos); 
    		if (cookie_end == -1){  
    				cookie_end = allcookies.length;  
    		}  
    		var value = unescape(allcookies.substring(cookie_pos, cookie_end)); 
    	}    
    	return value;  		
}