為啥自己另寫的script代碼沒生效呢
<body>
???? <h2 id="con">JavaScript</h2>
???? <p>HelloWorld</p>
?????<script type="text/javascript">
? ? ??? var mychar = document.getElementById("con");
? ? ??? document.write("原標題："+mychar.innerHTML+<br>);
? ??? ? mychar.innerHTML = "HelloWorld"；
? ??? ? document.write("修改后的標題："+mychar.innerHTML);
???? </script>
</body>
只輸出了
JavaScript
HelloWorld
2019-08-29
兩處小問題