標籤：doctype nload htm load cti 項目 img window javascrip
項目結構：
1 <!DOCTYPE html> 2 <html> 3 4 <head> 5 <meta charset="utf-8" /> 6 <title></title> 7 8 <!-- 引入 jQuery --> 9 <script src="js/jquery.js" type="text/javascript"></script>10 <script type="text/javascript">11 //等待dom元素載入完畢.12 $(document).ready(function() {13 alert("Hello World!");14 });15 16 //寫法17 //$(document).ready();18 //$(document).ready(function(){});19 </script>20 21 </head>22 23 <body>24 25 </body>26 27 </html>
$(document).ready(function( ){ });類似於傳統Javascript中的window.onload方法，不過與window.onload還是有些區別：
window.onload必須等待網頁中所有的內容載入完畢後（包括圖片）才能執行，
$(document).ready( )網頁中所有的DOM結構繪製完畢後就執行，可能DOM元素關聯的東西並沒有載入完，
$(document).ready(function( ){ });可以簡寫成$(function( ){ });
第一個JQuery程式
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