在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>

<p id="p1">Hello world!</p>

<script>
function ChangeText()
{
    document.getElementById("p1").innerHTML="Hello Codexy!";
}
</script>

<input type="button" onclick="ChangeText()" value="修改文本" />

</body>
</html>

源代码

动行结果