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<!DOCTYPE html>
<html>
<title>JavaScript onclick 事件示例 - 基础教程(div.cn)</title>
<body>
<h1>事件处理程序属性</h1>
<p id="para">单击此处更改此文本</p>
<script>
let para = document.querySelector("#para");
para.onclick = function() {
this.innerHTML = "Hello world";
}
</script>
</body>
</html>