Cookie 封装

新增

function setItem(sKey, sValue, vEnd, sPath, sDomain, bSecure) {
  if (!sKey || /^(?:expires|max\-age|path|domain|secure)$/i.test(sKey)) {
    return false;
  }
  let sExpires = "";
  if (vEnd) {
    switch (vEnd.constructor) {
      case Number:
        sExpires =
          vEnd === Infinity
            ? "; expires=Fri, 31 Dec 9999 23:59:59 GMT"
            : "; max-age=" + vEnd;
        break;
      case String:
        sExpires = "; expires=" + vEnd;
        break;
      case Date:
        sExpires = "; expires=" + vEnd.toUTCString();
        break;
    }
  }
  document.cookie =
    encodeURIComponent(sKey) +
    "=" +
    encodeURIComponent(sValue) +
    sExpires +
    (sDomain ? "; domain=" + sDomain : "") +
    (sPath ? "; path=" + sPath : "") +
    (bSecure ? "; secure" : "");
  return true;
}

判断 cookie 是否存在

function hasItem(sKey) {
  return new RegExp(
    "(?:^|;\\s*)" +
      encodeURIComponent(sKey).replace(/[-.+*]/g, "\\$&") +
      "\\s*\\="
  ).test(document.cookie);
}

删除

function removeItem(sKey, sPath, sDomain) {
  if (!sKey || !this.hasItem(sKey)) {
    return false;
  }
  document.cookie =
    encodeURIComponent(sKey) +
    "=; expires=Thu, 01 Jan 1970 00:00:00 GMT" +
    (sDomain ? "; domain=" + sDomain : "") +
    (sPath ? "; path=" + sPath : "");
  return true;
}

获取 cookie 的 key 的集合

function keys() {
  let aKeys = document.cookie
    .replace(/((?:^|\s*;)[^\=]+)(?=;|$)|^\s*|\s*(?:\=[^;]*)?(?:\1|$)/g, "")
    .split(/\s*(?:\=[^;]*)?;\s*/);
  for (let nIdx = 0; nIdx < aKeys.length; nIdx++) {
    aKeys[nIdx] = decodeURIComponent(aKeys[nIdx]);
  }
  return aKeys;
}

cookie 相关的函数来源于 MDN