javascript en ejemplo de código de mouseover

Ejemplo 1: addeventlistener hover js

let test = document.getElementById("test");

test.addEventListener("mouseover", function( event ) {
  alert("mouse over test!")
  , false);

Ejemplo 2: evento de desplazamiento de javascript

element.onmouseover = function() {
  //Hovering
}

Ejemplo 3: javascript mouse up mouse down

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

<script>
function mouseDown() {
}

function mouseUp() {
}
</script>

Ejemplo 4: javascript al pasar el mouse

<img onmouseover="enlargeImage(this)" border="0" src="https://foroayuda.es/smiley.gif" alt="Smiley" width="32" height="32">

<script>
function enlargeImage(x) {
  x.style.height = "64px";
  x.style.width = "64px";
}
</script>

Ejemplo 5: al pasar el mouse sobre javascript

The mouseover event is fired at an Element when a pointing device 
(such as a mouse or trackpad) is used to move the cursor onto the 
element or one of its child elements.

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