js之cookie的使用

写入cookie

function setCookie(name, value) {
      var Days = 30;
      var exp = new Date();
      exp.setTime(exp.getTime() + Days * 24 * 60 * 60 * 1000);
      document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString();
}

读取cookie

function getCookie(name) {
    var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");
    if (arr = document.cookie.match(reg)) return unescape(arr[2]);
    else return null;
}

删除cookie

function delCookie(name) {
    var exp = new Date();
    exp.setTime(exp.getTime() - 1);
    var cval = getCookie(name);
    if (cval != null) document.cookie = name + "=" + cval + ";expires=" + exp.toGMTString();
}