javascript event detect mouse down code example

Example 1: javascript mouse up mouse down

<p id="myP" onmousedown="mouseDown()" onmouseup="mouseUp()">

<script>
function mouseDown() {
}

function mouseUp() {
}
</script>

Example 2: js detect mouse support

if (matchMedia('(pointer:fine)').matches) {
  // Device has a mouse
}