更改方法：1、使用“document.getElementsByTagName("title")[0].innerText="需要设置的值";”语句来修改；2、使用“document.title="需要设置的值";”语句来修改。
本教程操作环境：windows7系统、javascript1.8.5版、Dell G3电脑。
javascript更改title标题
1、innerText 方式
通过console.log(document.getElementsByTagName("title")[0]),发现能打印出
标签，标签里面只有文字节点，故猜测只能识别TextNode，所以用innerText方式设置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">登录后复制</div></div><p><strong>2、document.title方式</strong><br/></p><p>经过测试，还可通过document.title 设置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">登录后复制</div></div><p>例子</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">登录后复制</div></div><p>我们在浏览器取得了焦点和失去焦点的时候改变title的值，可以发现切换浏览器选项卡的时候，title发生了改变。</p>
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