code: function (key) {
  
                  document.body.appendChild(container);
                  container.removeAttribute(key);
                  container.save(LOCAL_FILE);
                  document.body.removeChild(container);
  
              }
docs: // 暂时没有用到 clear: function () {  var expiresTime = new Date(); expiresTime.setFullYear(expiresTime.getFullYear() - 1); document.body.appendChild(container); container.expires = expiresTime.toUTCString(); container.save(LOCAL_FILE); document.body.removeChild(container);  },