javascript document.cookie 的写入，读取，删除~~

//cookie
function comm_read_cookie(name){var cookieValue = "", search = name + "=";if(document.cookie.length > 0){offset = document.cookie.indexOf(search);if (offset != -1){offset += search.length;end = document.cookie.indexOf(";", offset);if (end == -1) end = document.cookie.length;cookieValue = unescape(document.cookie.substring(offset, end));}}return cookieValue;};

function comm_set_cookie(name,value,expirehours){var expiration = new Date((new Date()).getTime() +expirehours*3600000);document.cookie = name+ "=" + value + ";expires=" + expiration.toGMTString()+";domain=www.4usky.com;path=/";}

function delCookie(name){
 var expiration = new Date((new Date()).getTime()-10);
 var cval=comm_read_cookie(name);
 if(cval!=null) document.cookie=name+"="+cval+";path=/;expires="+expiration.toGMTString();
}

默认没有设置path的话path就是页面所在的目录下， 这个cookie也只能被这个目录和这个目录下的子目录的页面所访问。

要想全访问就设置path=/