How to make a option to hide the element on the second press?

var opened = false; // create a Boolean variable flag, which will record the status
var button, content; // the button and the block

button.addEventListener("click", function () {
 if (opened) {
 // if the variable says that the box is opened - close
 opened = false; // writable is closed
 content.style.display = "none";
 } else {
 // if the variable recorded in the hidden block - open
 opened = true; // writable open
 content.style.display = "block";
}
}, false);