JavaScript通过addEventListener添加事件监听
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<!DOCTYPE html>
<html lang="en">
<head>
<title>This text is the title of the document</title>
<script>
function showalert(){
alert('you clicked me!');
}
function clickme(){
var pelement=document.getElementsByTagName('p')[0];
pelement.addEventListener('click', showalert, false);
}
window.addEventListener('load', clickme, false);
</script>
</head>
<body>
<div id="main">
<p>Click Me</p>
<p>You Can't Click Me</p>
</div>
</body>
</html>
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