js放的位置不對，獲取的數據也是不一樣的~~~
<!doctype?html>
<html>
<head>
<meta?charset="utf-8">
<title>無標題文檔</title>
</head>
<body>
<p?id="con">javascript</p>
<script?type="text/javascript">
var?mycar=?document.getElementById("con");
document.write("結果是:"+mycar);
</script>
</body>
</html>
<!doctype?html>
<html>
<head>
<meta?charset="utf-8">
<title>無標題文檔</title>
<script?type="text/javascript">
var?mycar=?document.getElementById("con");
document.write("結果是:"+mycar);
</script>
</head>
<body>
<p?id="con">javascript</p>
</body>
</html>各位大神幫忙解釋下是什么愿意呢~~~謝謝哦~~~
2015-01-06
頁面是順序加載的，當加載script的時候，body中的內容還沒加載，這個時候獲取就是null