<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>事件的触发</title>
<script type="text/javascript">
function on_Mousedown() {
alert("你按下了按钮，通过onmousedown方法触发了mousedown事件");
}
function on_Mouseup() {
alert("你按下鼠标并松开了，通过onmouseup方法触发了mouseup事件");
}
function on_Mouseover() {
alert("鼠标移动到了按钮，通过onmouseover方法触发了mouseover事件");
}
function on_Mouseout() {
alert("鼠标移出了按钮，通过onmouseout方法触发了mouseout事件");
}
</script>
</head>
<body>
<input type="button"value="按下鼠标触发事件"onmousedown="on_Mousedown();"/>
<br />
<br />
<input type="button"value="按下鼠标松开时触发事件"onmouseup="on_Mouseup();"/>
<br />
<br />
<input type="button"
value="移动鼠标到按钮触发事件"onmouseover="on_Mouseover();"/>
<br />
<br />
<input type="button"value="移开鼠标触发事件"onmouseout="on_Mouseout();"/>
</body>
</html>
