設定頁面標題的方法：1、使用「document.getElementsByTagName("title")[0].innerText='需要設定的值';」語句；2、使用「document.title = '需要設定的值';”語句。
本教學操作環境：windows7系統、javascript1.8.5版、Dell G3電腦。
title在html中屬於特殊的節點元素
因為它可以使用document.getElementsByTagName("title")[0]來取得網頁的title標籤，但卻無法用document.getElementsByTagName("title")[0].innerHtml來改變它的值。
經過測試原生js有兩種方式可以修改，以下來介紹一下。
JavaScript設定頁面標題的方法
#1、innerText 方式
透過console.log (document.getElementsByTagName("title")[0]),發現能印出
標籤，標籤裡面只有文字節點，故猜測只能辨識TextNode，所以用innerText方式設定title的值，果然成功了。 </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>document.getElementsByTagName("title")[0].innerText = '需要设置的值';</pre><div class="contentsignin">登入後複製</div></div><p><strong>2、document.title方式</strong><br/></p><p>#經過測試，也可透過document.title 設定title的值。 </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>console.log(document.title); # 可以获取title的值。
document.title = '需要设置的值'; # 设置title的值。</pre><div class="contentsignin">登入後複製</div></div><p>範例</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>window.onfocus = function () {
document.title = '恢复正常了...';
};
window.onblur = function () {
document.title = '快回来~页面崩溃了';
};</pre><div class="contentsignin">登入後複製</div></div><p>【推薦學習：<a href="https://www.php.cn/course/list/2.html" target="_blank">javascript高階教學</a>】</p><p>以上是JavaScript怎麼設定頁面標題的詳細內容。更多資訊請關注PHP中文網其他相關文章！</p>
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