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try this,
document.querySelector("button").addEventListener("click", changeDiv);
function changeDiv(){
var element = document.getElementById("element1");
element.style.display = (element.style.display == 'none') ? 'block' : 'none';
}#element1{display:block}<div id="element1">Sample</div>
<button>Click here</button>2
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solved if display is block change it to none with javascript