How to change onclick using Javascript?

Question

How to change onclick using Javascript ?

https://jsfiddle.net/749rt0m7/1/

I tried to use this code, but it does not work. How can I do it?

<span  onclick="test_fn('aaa,bbb')" id="xx">edit</span>
<script>
    document.getElementById('xx').onclick = "test_fn(111,222)";
</script>

Answer 1

document.getElementById('xx').onclick = function() {
  test_fn(111, 222);
};

When setting onclick in HTML, use a string. When setting it through JS, use a function.