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

this code work for me

  var btn = document.getElementById("your_btn_id");
    if(btn.innerText=="show"){
       btn.innerText="hide";
      }
    else{
      btn.innerText="show";
      }

using value is not work in my case