Change career development, code 100 days - 2018-05-02
1. Event object
The event object in JavaScript is usually represented by the definition variable ev or event. In order to take into account browser compatibility issues, define the event object as
var oEvent = home||event;
2. Mouse events
Mouse events usually get the mouse click position clientX;clientY
Mouse move event: onmousemove;
Mouse click event: onmousedown;
Mouse up event: onmouseup;
Such as setting up a mouse follow program:
Objects move with the mouse.
<!DOCTYPE html>
<html>
<head>
<title>javascript mouse events</title>
<style type="text/css">
#div1{width: 100px;height: 100px;background: red;position: absolute;}
</style>
<script type="text/javascript">
document.onmousemove = function(ev)
{
var oEvent = ev||event;
var oDiv = document.getElementById("div1");
var scrollTop = document.documentElement.scrollTop||document.body.scrollTop;
oDiv.style.left = oEvent.clientX+"px";
oDiv.style.top = oEvent.clientY+scrollTop+"px";
}
</script>
</head>
<body style="height: 2000px;">
<div id="div1"></div>
</body>
</html>
3. Event Bubbling