Changing button text onclick

Question

When I click on myButton1 button, I want the value to change to Close Curtain from Open Curtain.
HTML:

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Answer 1

Add this function to the script

function myFunction() {

                var btn = document.getElementById("myButton");

                if (btn.value == "Open Curtain") {
                    btn.value = "Close Curtain";
                    btn.innerHTML = "Close Curtain";
                }
                else {
                    btn.value = "Open Curtain";
                    btn.innerHTML = "Open Curtain";
                }

            }

and edit the button

Open Curtain