<!DOCTYPE html>
<html>
<head>
<script>
function myFunction()
{
document.getElementById("demo").innerHTML="My HelloWorld JavaScript Function";
}
</script>
</head>

<body>

<h1>My Web Page</h1>

<p id="demo">A Paragraph.</p>

<button type="button" onclick="myFunction()">点这里</button>

</body>
</html>

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