jquery cookie 插件

/**
 * jquery cookie插件
 * 使用：
 * $.cookie('key'); //读取Cookie值
 * $.cookie('key', 'value'); // 设置/新建cookie的值
 * $.cookie('key', 'value', {expires: 7, path: '/', domain: 'dh89.com', secure: true});//新建一个cookie 包括有效期(天数) 路径 域名等
 * $.cookie('key', null); //删除一个cookie
 */
jQuery.cookie = function (name, value, options) { 
if
 (typeof value != 
"undefined"
) { options = options || {}; 
if
 (value === 
null
) { value = 
""
; options.expires = -
1
; } var expires = 
""
; 
if
 (options.expires && (typeof options.expires == 
"number"
 || options.expires.toUTCString)) { var date; 
if
 (typeof options.expires == 
"number"
) { date = 
new
 Date(); date.setTime(date.getTime() + (options.expires * 
24
 * 
60
 * 
60
 * 
1000
)); } 
else
 { date = options.expires; } expires = 
"; expires="
 + date.toUTCString(); } var path = options.path ? 
"; path="
 + options.path : 
""
; var domain = options.domain ? 
"; domain="
 + options.domain : 
""
; var secure = options.secure ? 
"; secure"
 : 
""
; document.cookie = [name, 
"="
, encodeURIComponent(value), expires, path, domain, secure].join(
""
); } 
else
 { var cookieValue = 
null
; 
if
 (document.cookie && document.cookie != 
""
) { var cookies = document.cookie.split(
";"
); 
for
 (var i = 
0
; i < cookies.length; i++) { var cookie = jQuery.trim(cookies[i]); 
if
 (cookie.substring(
0
, name.length + 
1
) == (name + 
"="
)) { cookieValue = decodeURIComponent(cookie.substring(name.length + 
1
)); 
break
; } } } 
return
 cookieValue; } };