<html>
<head>
<script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
$("p").mouseover(function(){
$("p").css("background-color","yellow");
});
$("p").mouseout(function(){
$("p").css("background-color","lightgray");
});
$("#btn1").click(function(){
$("p").mouseover();
});
$("#btn2").click(function(){
$("p").mouseout();
});
});
</script>
</head>
<body>
<p>Move the mouse pointer over this paragraph.</p>
<button id="btn1">Trigger mouseover event</button><br>
<button id="btn2">Trigger mouseout event</button>
</body>
</html>