標籤：
JavaScript是一種網頁的指令碼程式設計語言，支援用戶端與伺服器的應用程式以及構件的開發！它是一種解釋性語言，需編譯後才可以運行！
具體的文法就不在這裡說明啦!JavaScript在網頁中的使用有兩種方式:直接加入網頁中和引用方式！我只是簡單的使用，平時就用第一種直接加入網頁的方式！
下面是簡單的使用JavaScript檢查頁面表單的輸入是否為空白及效果代碼圖：
1 <html> 2 <head> 3 </head> 4 <body> 5 <script language = "JavaScript"> 6 function CheckForm(){ 7 if (document.myForm.username.value == "") { 8 alert("請輸入標題!!!"); 9 document.myform.title.focus();10 return false;11 }12 return true;13 }14 </script>15 <h1 align = "center">登入介面</h1>16 <hr>17 <center>18 <form name = "myForm" action="#" method="post" onSubmit = "return CheckForm()">19 使用者名稱:<input name = "username" type = "Text" /><br>20 密 碼:<input name = "password" type = "password"/><br>21 <input value = "登入" type = "submit" />22 <input value = "註冊" type = "submit" /><br>23 </center>24 </body>25 </html>
這裡只是簡單的使用與入門，大家感興趣可以深入地去學習哈！！！
jsp——學習篇：簡單使用JavaScript
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