JS 模拟鼠标事件mouse over、click,kepress

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta http-equiv="content-type" content="text/html; charset=utf-8">
    <meta name="renderer" content="webkit"/>
    <meta name="force-rendering" content="webkit"/>
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <meta http-equiv="Cache-Control" content="no-siteapp" />
    <title>test mouse event</title>
	<style>
	body,html{
	background:#777;

	}
	</style>

</head>
  <body>
 document.querySelector(".ttt").click()

 --------------------
iiiiiiiiii

mouseover 

mousedown
<br/>
<div class="ttt" style="background:red;" onclick="show()">
8888888888
</div>

<script>

document.body.addEventListener("mouseover", function () { console.log("mouseover");});
document.body.addEventListener("mousedown", function () { console.log("mousedown");});
document.body.addEventListener("mouseenter", function () { console.log("mouseenter");});
document.body.addEventListener("click", function () { console.log("click");});

document.body.addEventListener("keypress", function () { console.log("keypress-------");});

// 随意按下一个键盘按键 document.onkeydown = function(){ console.log('keydown') } document.onkeypress= function(){ console.log('onkeypress') } document.onkeyup = function(){ console.log('onkeyup') } // keydown onkeypress onkeyup function show(){ alert(000); } setInterval(function(){ //mouse over var event = document.createEvent("MouseEvents"); event.initEvent('mouseover', true, false); document.body.dispatchEvent(event); console.log('createEvent'); //click const event2 = document.createEvent('Events'); event2.initEvent( 'click', true, false ); document.body.dispatchEvent(event2);
var event3 = document.createEvent("UIEvents");
event3.initUIEvent("keypress", true, true, window, 1);
event3.keyCode = 38;//up
document.body.dispatchEvent(event3);

}, 3000);

</script>

 </body>

</html>

　　

参考：https://www.cnblogs.com/h2285409/p/15989615.html