標籤：style blog java io 2014 re c 問題
$(document).ready() 裡的代碼是在頁面內容都載入完才執行的，如果把代碼直接寫到script標籤裡，當頁面載入完這個script標籤就會執行裡邊的代碼了，此時如果你標籤裡執行的代碼調用了當前還沒載入過來的代碼或者dom，那麼就會報錯，當然如果你把script標籤放到頁面最後面那麼就沒問題了，此時和ready效果一樣。
$(document).ready(function(){})可以簡寫成$(function(){});
點擊段落後，此段落隱藏：
<html><head><script type="text/javascript" src="jquery.js"></script><script type="text/javascript">$(document).ready(function(){ $("p").click(function(){ $(this).hide(); });});</script></head><body> <p>If you click on me, I will disappear.</p></body></html>
<html><head><script type="text/javascript" src="jquery.js"></script><script type="text/javascript"> $("p").click(function(){ $(this).hide(); });</script></head><body> <p>If you click on me, I will disappear.</p></body></html>
<html><head></head><body> <p>If you click on me, I will disappear.</p></body><script type="text/javascript" src="jquery-1.7.2.min.js"></script><script type="text/javascript"> $("p").click(function(){ $(this).hide(); });</script></html>
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