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**你可以在这任意尝试编写内容，熟悉wiki语法。**

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测试测试
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TEST my Test
一个小小的测试哦
====== 一级标题 ======

===== 标题 H2  =====

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$\begin{array}{l}   \text{对于方程形如：}x^{3}-1=0 \\   \text{设}\text{:}\omega =\frac{-1+\sqrt{3}i}{2} \\   x_{1}=1,x_{2}= \omega =\frac{-1+\sqrt{3}i}{2} \\   x_{3}= \omega ^{2}=\frac{-1-\sqrt{3}i}{2} \end{array} $


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$\frac{a}{b}\pm \frac{c}{d}= \frac{ad \pm bc}{bd} $


$$\frac{a}{b}\pm \frac{c}{d}= \frac{ad \pm bc}{bd} $$

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$\left\{\begin{matrix}   x=a + r\text{cos}\theta \\    y=b + r\text{sin}\theta \end{matrix}\right. $


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$\frac{\mathrm{d}}{\mathrm{d}x}\sin x=\cos x $


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$\begin{pmatrix}    a_{11} & a_{12} & a_{13} \\    a_{21} & a_{22} & a_{23} \\    a_{31} & a_{32} & a_{33}  \end{pmatrix} $

==== 标题 H3 ====


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====== 标题 H1 ======


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<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <style>
    body {
      font-family: 'Arial', sans-serif;
      margin: 50px;
    }

    #countdown {
      font-size: 24px;
      margin-top: 20px;
    }
  </style>
</head>
<body>

  <h1>倒计时</h1>

  <label for="birthdate">输入你的消失日期：</label>
  <input type="date" id="birthdate">
  <button onclick="startCountdown()">开始倒计时</button>

  <div id="countdown"></div>

  <script>
    let countdownInterval;

    function startCountdown() {
      // 清除之前的倒计时定时器
      clearInterval(countdownInterval);

      // 获取用户输入的日期
      const birthdateInput = document.getElementById('birthdate');
      const birthdate = new Date(birthdateInput.value);

      // 更新倒计时显示
      updateCountdown(birthdate);

      // 每秒更新一次倒计时
      countdownInterval = setInterval(() => {
        updateCountdown(birthdate);
      }, 1000);
    }

    function updateCountdown(birthdate) {
      // 获取当前日期和时间
      const now = new Date();

      // 计算距离日期的秒数
      const timeDifference = Math.floor((birthdate - now) / 1000);

      // 更新页面上的倒计时显示
      const countdownElement = document.getElementById('countdown');
      countdownElement.textContent = `人生还剩余 ${timeDifference} 秒`;
    }
  </script>

</body>
</html>
====== 灌水 ======

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测试页面

__//下划线//**粗体**__  //2289234//__下划线__ <del>''删除线'' </del>

[[:playground:test|]]

[[:playground:测试|]]

[[:playground:测试23|]]

:-D :-P ĊÊ



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输入下面这行代码，就可以轻松嵌入外部视频。
<code>

 <html>
<div style="position: relative; padding: 30% 45%;">
<iframe style="position: absolute; width: 100%; height: 100%; left: 0; top: 0;" src="//player.bilibili.com/player.html?aid=796638778&bvid=BV1xC4y1879V&cid=222616800&page=1&as_wide=1&high_quality=1&danmaku=0" frameborder="no" scrolling="no"></iframe>

</div>
</html>

</code>

效果：

<html> <div style="position: relative; padding: 30% 45%;"> <iframe style="position: absolute; width: 100%; height: 100%; left: 0; top: 0;" src="//player.bilibili.com/player.html?aid=796638778&bvid=BV1xC4y1879V&cid=222616800&page=1&as_wide=1&high_quality=1&danmaku=0" frameborder="no" scrolling="no"></iframe> </div> </html> —- 


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====== 必应搜索 ====== 
<code>
<html> <div style="position: relative; padding: 30% 45%;"> <iframe style="position: absolute; width: 100%; height: 100%; left: 0; top: 0;" src="//www.bing.com" frameborder="no" ></iframe>
</div> </html>
</code>

**上面是代码，下面是具体效果：**

<html> <div style="position: relative; padding: 30% 45%;"> <iframe style="position: absolute; width: 100%; height: 100%; left: 0; top: 0;" src="//www.bing.com" frameborder="no" ></iframe>
</div> </html>


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<code>
#include<stdio.h>
int main(int argc, char** argv) {
    printf("Hello world/n");
    return 0;
}
</code>