?????? ??
JavaScript ??
JavaScript ??? ???? ??? ???? ?? ? ????.
JavaScript Comments
JavaScript? ??? ???? ????.
JavaScript? ????? ??? ???? ??? ?? ??? ??? ? ????.
? ? ??? //? ?????.
? ???? ? ? ??? ???? ??? ?????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<h1 id="myH1"></h1>
<p id="myP"></p>
<script>
// 輸出標(biāo)題：
document.getElementById("myH1").innerHTML="Welcome to my Homepage";
// 輸出段落：
document.getElementById("myP").innerHTML="This is my first paragraph.";
</script>
<p><b>注釋：</b>注釋不會(huì)被執(zhí)行。</p>
</body>
</html>JavaScript ?? ? ??
?? ??? /*? ???? */? ????.
?? ???? ?? ? ??? ???? ??? ?????.
<!DOCTYPE html>
<html>
<head>
<title></title>
<meta charset="utf-8">
</head>
<body>
<h1 id="myH1"></h1>
<p id="myP"></p>
<script>
/*
下面的這些代碼會(huì)輸出
一個(gè)標(biāo)題和一個(gè)段落
并將代表主頁(yè)的開(kāi)始
*/
document.getElementById("myH1").innerHTML="歡迎來(lái)到php中文網(wǎng)";
document.getElementById("myP").innerHTML="這是一個(gè)段落。";
</script>
<p><b>注釋：</b>注釋塊不會(huì)被執(zhí)行。</p>
</body>
</html>??? ???? ?? ??
?? ???? ??? ???? ?? ? ? ??? ??? ?????. ??(???? ?? ??):
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <p>注釋</p> //這是注釋 </body> </html>
? ?? ?? ??
?? ???? ?? ? ?? ??? ????.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<p id="myP"></p>
<script>
var x=5; // 聲明 x 并把 5 賦值給它
var y=x+2; // 聲明 y 并把 x+2 賦值給它
document.getElementById("myP").innerHTML=y // 把 y 的值寫(xiě)到 myP
</script>
<p><b>注釋：</b>注釋不會(huì)被執(zhí)行。</p>
</body>
</html>
