## cookie 的简单封装  写的匆忙 有不对的地方请指正 

var cookies = {

  set: function (name, value, flag) { // flag == fasle 不设置时间

    var Days = 7;

    var exp = new Date();

    exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);

    if (!flag) {

      document.cookie = name + "=" + escape(value) + ';path=/;';

    } else {

      document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString() +';path=/;';

    }

  },

  get: function (name) {

    var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");

    if (arr = document.cookie.match(reg))

      return unescape(arr[2]);

    else

      return null;

  },

  del: function (name) {

    var exp = new Date();

    exp.setTime(exp.getTime() - 1);

    var cval = this.get(name);

    if (cval != null)

      document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();

  }

}