How to change the buttons text using javascript

Question

I have the following code to set the text of the button through javascript code , but it does not work it remains same the text remains same.

function showFilter         


        

Answer 1

innerText is the current correct answer for this. The other answers are outdated and incorrect.

document.getElementById('ShowButton').innerText = 'Show filter';

innerHTML also works, and can be used to insert HTML.