?????? ??
JavaScript?? ?? ?? ?? ??? ????.
JavaScript? ???? ??? ??
JavaScript? ??? ???? ???? ??? ? ????.
window.alert()? ???? ?? ??? ?????.
HTML ??? ??? ??? document.write() ???? ?????.
innerHTML? ???? HTML ??? ???.
???? ??? ??? console.log()? ?????. ??? JavaScript? HTML ??, document.getElementById(id) ???? ??? ? ????.
HTML ??? ????? "id" ??? ???? ?? ???? ????? ????? innerHTML? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP中文網(wǎng)（php.cn)</title>
</head>
<body>
<h1>我的第一個(gè)頁面</h1>
<p>我的第一個(gè)段落。</p>
<script>
window.alert('你好嗎');
</script>
</body>
</html>????? ???? ??? ???
?? JavaScript ?(<script> ??? ??)? ??? ????. ? ?????? ??:
document.getElementById("demo")? id ??? ???? HTML ??? ?? JavaScript ?????.
HTML ??? ??
HTML ??? JavaScript? ?? ??? ? ????.<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP中文網(wǎng)（php.cn）</title>
</head>
<body>
<h1>PHP中文網(wǎng)</h1>
<p id="demo">我的第一個(gè)段落。</p>
<script>
document.getElementById("demo").innerHTML="段落已修改。";
</script>
</body>
</html>????? ???? ??? ?????: ?? ???? ??? ??? document.write()? ??????. . ?? ??? ??? ? document.write? ???? ?? HTML ???? ???? ???. ??? ??<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>PHP中文網(wǎng)（php.cn）</title> </head> <body> <h1>我的第一個(gè) Web 頁面</h1> <p>我的第一個(gè)段落。</p> <script> document.write(Date()); </script> </body> </html>????? ???? ??? ???Write to the console
????? ???? ???? ?? console.log() ???? ???? ????? JavaScript ?? ??? ? ????.
?????? F12? ???? ??? ??? ????? ??? ??? "??" ??? ?????.<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>PHP中文網(wǎng)(php.cn)</title>
</head>
<body>
<h1>我的第一個(gè) Web 頁面</h1>
<p>我的第一個(gè)段落。</p>
<button onclick="myFunction()">點(diǎn)我</button>
<script>
function myFunction()
{
document.write(Date());
}
</script>
</body>
</html>????? ???? ??? ???
