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この単純なコードは教育目的のものであるにもかかわらず、なぜ私が間違っているのかを特定するのを手伝ってください。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
                "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <title>Random thoughts part one</title>
    <meta http-equiv="content-type" content="text/html;charset = utf-8" />
    <meta name="keywords" content="thoughts, random, philosophy, mohamed, samir ,sameer, muhammad , mohammed samir" />
    <meta name="description" content="This is a personal page about Mohamed Samir khalil that contain his thoughts and believes" />
    <link rel="stylesheet" type="text/css" href="style.css">
      <body>
        <script type="text/javascript">//
            <![CDATA[

                    alert("hello");
                    var target = document.getElementById("unique_element");
                    alert(target.length);
            //]]>
        </script>
        <center>
          <h3>Random thoughts</h3>
        </center>
        <p id="unique_element">I do not think it is coincidence, because every time I walk in streets I have that strong feeling that keeps telling me &#8221;Man, you have to help people!&#8221;.</p>
        <p>In the beginning I thought that because of thinned for recognition I mean I do this just to hear people say &#8220;thank you&#8221; and to hear people say &#8220;it is great thing that you
        are between us&#8221; so I thought it is all about ego, but you know when I really realized that it is not about ego!</p>
        <p>I realized that when I helped someone and they did not say thank you, what was supposed to happen is that , I should feel anger because it is all about ego, right?</p>
        <p>But what really happened that I felt happy just to help now people who are reading this will say either &#8220;you are so kind&#8221; or &#8220;Okay, you want to make it up huh!&#8221;but
        the reality is just neither this or that ; actually I realized that I am helping people because this is what make us humans and this thing let us feel that we are not alone in this world so
        it is kind of socializing too and also when you help people, I guarantee that someday someone will help you in a very tough situation and he or she will come out of nowhere this is the rule
        of life and this is how people should live.</p>
      </body>
    </link>
  </head>
</html>
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2 に答える 2

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DOMが解析される前にスクリプトが実行されるため、次のようになります。

var target = document.getElementById("unique_element");

HTML 要素を返さず、target.length単に失敗します。終了タグの前に JavaScript 部分を配置してみてください</body>。

于 2013-02-27T14:32:04.120 に答える
0

DOM 要素の長さを表示しようとしています。alert(target.innerHTML.length);代わりに試してください。

于 2013-02-27T14:31:02.063 に答える