js 操作cookie的类

var cookie = {set: function(key, value, days) {document.cookie = 'tomato_' + key + '=' + value + '; expires=' +(new Date(new Date().getTime() + ((days ? days : 14) * 86400000))).toUTCString() + '; path=/';},get: function(key) {var r = ('; ' + document.cookie + ';').match('; tomato_' + key + '=(.*?);');return r ? r[1] : null;},unset: function(key) {document.cookie = 'tomato_' + key + '=; expires=' +(new Date(1)).toUTCString() + '; path=/';}};