Leanote Markdown 效果

Welcome to Leanote!
===================

![leantoe](http://leanote.com/file/outputImage?fileId=542f89204fadc0486200000c)

# h1
## h2
### h3
#### h4
##### h4
###### h5

## MathJax 公式
$$
\begin{eqnarray}
\vec\nabla \times (\vec\nabla f) & = & 0  \cdots\cdots梯度场必是无旋场\\
\vec\nabla \cdot(\vec\nabla \times \vec F) & = & 0\cdots\cdots旋度场必是无散场\\
\vec\nabla \cdot (\vec\nabla f) & = & {\vec\nabla}^2f\\
\vec\nabla \times(\vec\nabla \times \vec F) & = & \vec\nabla(\vec\nabla \cdot \vec F) - {\vec\nabla}^2 \vec F\\
\end{eqnarray}
$$

--------------------------------

$$
\begin{array}{lll}
    %最上面的一小行
    \,\,\,微分形式 & &\,\,\,积分形式\\
    %微分形式
    \begin{cases}
        \vec\nabla \times \vec H = \vec J + {\partial \vec D \over \partial \vec t} & (1)\\
        \vec\nabla \times \vec E = -{\partial \vec B \over \partial t} & (2)\\
        \vec\nabla \cdot \vec B = 0 & (3)\\
        \vec\nabla \cdot \vec D = \rho & (4)
    \end{cases}
    &
    %推导条件
    \begin{array}[]{}
        \underleftrightarrow{\iint_\vec S (\vec\nabla \times \vec F)d\vec S = \oint_\vec l \vec F \cdot d \vec l}\\
        %下面的两行是为了空出来中间的位置
        \,\\
        \,\\
        \underleftrightarrow{\iiint_\vec S \vec\nabla \cdot \vec Fd\vec V = \iint_\vec S \vec F \cdot d \vec S}\\ 
        %实在是没有办法，不支持\oiint ,只能用\iint代替了，见谅
    \end{array} 
    &
    %积分形式
    \begin{cases}
        \oint_\vec l \vec H \cdot d\vec l=-\int_\vec S (\vec J + {\partial \vec D \over \partial t} \cdot d\vec S) & (1)\\
        \oint_\vec l \vec E \cdot d \vec l = - \int _ \vec S({\partial \vec B \over \partial \vec t})\cdot d \vec S & (2)\\
        \int_\vec S \vec B\cdot d \vec S = 0& (3)\\
        \int_\vec S \vec D \cdot d \vec S = Q&(4)
    \end{cases}
\end{array}
$$

**strong text**
Hey! I'm your first Markdown document in **Leanote**[^Leanote].

Markdown Extra
--------------------

Leanote supports **Markdown Extra**, which extends **Markdown** syntax with some nice features.

> **Tip:** You can disable any **Markdown Extra** feature in the **Extensions** tab of the <i class="icon-cog"></i> **Settings** dialog.

> **Note:** You can find more information about **Markdown** syntax [here][2] and **Markdown Extra** extension [here][3].

### Tables

**Markdown Extra** has a special syntax for tables:

Item     | Value
-------- | ---
Computer | $1600
Phone    | $12
Pipe     | $1

You can specify column alignment with one or two colons:

| Item     | Value | Qty   |
| :------- | ----: | :---: |
| Computer | $1600 |  5    |
| Phone    | $12   |  12   |
| Pipe     | $1    |  234  |

### Definition Lists

**Markdown Extra** has a special syntax for definition lists too:

Term 1
Term 2
:   Definition A
:   Definition B

Term 3

:   Definition C

:   Definition D

> part of definition D

### Fenced code blocks

GitHub's fenced code blocks are also supported with **Highlight.js** syntax highlighting:

```
// Foo
var bar = 0;
```

> **Tip:** To use **Prettify** instead of **Highlight.js**, just configure the **Markdown Extra** extension in the <i class="icon-cog"></i> **Settings** dialog.

> **Note:** You can find more information:

> - about **Prettify** syntax highlighting [here][5],
> - about **Highlight.js** syntax highlighting [here][6].

### Footnotes

You can create footnotes like this[^footnote].

[^footnote]: Here is the *text* of the **footnote**.

### SmartyPants

SmartyPants converts ASCII punctuation characters into "smart" typographic punctuation HTML entities. For example:

|                  | ASCII                        | HTML              |
 ----------------- | ---------------------------- | ------------------
| Single backticks | `'Isn't this fun?'`            | 'Isn't this fun?' |
| Quotes           | `"Isn't this fun?"`            | "Isn't this fun?" |
| Dashes           | `-- is en-dash, --- is em-dash` | -- is en-dash, --- is em-dash |

### Table of contents

You can insert a table of contents using the marker `[TOC]`:

[TOC]

### MathJax 科学公式

$$E=mc^2$$

$$$\sqrt{3x-1}+(1+x)^2$$$
                    
$$\sin(\alpha)^{\theta}=\sum_{i=0}^{n}(x^i + \cos(f))$$
You can render *LaTeX* mathematical expressions using **MathJax**, as on [math.stackexchange.com][1]:

The *Gamma function* satisfying $\Gamma(n) = (n-1)!\quad\forall n\in\mathbb N$ is via the Euler integral

$$
\Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt\,.
$$

> **Tip:** To make sure mathematical expressions are rendered properly on your website, include **MathJax** into your template:

```
<script type="text/javascript" src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML"></script>
```

> **Note:** You can find more information about **LaTeX** mathematical expressions [here][4].

### UML diagrams

You can also render sequence diagrams like this:

```sequence
Alice->Bob: Hello Bob, how are you?
Note right of Bob: Bob thinks
Bob-->Alice: I am good thanks!
```

And flow charts like this:

```flow
st=>start: Start
e=>end
op=>operation: My Operation
cond=>condition: Yes or No?

st->op->cond
cond(yes)->e
cond(no)->op
```

> **Note:** You can find more information:

> - about **Sequence diagrams** syntax [here][7],
> - about **Flow charts** syntax [here][8].

### Support Leanote

Alipay Donation:

![leantoe donation](http://leanote.org/images/leanote/leanote_alipay.jpg)

[^Leanote]: [Leanote](https://stackedit.io/) is a full-featured, open-source Markdown editor based on PageDown, the Markdown library used by Stack Overflow and the other Stack Exchange sites.

[1]: http://math.stackexchange.com/
  [2]: http://daringfireball.net/projects/markdown/syntax "Markdown"
  [3]: https://github.com/jmcmanus/pagedown-extra "Pagedown Extra"
  [4]: http://meta.math.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference*emphasized text*
  [5]: https://code.google.com/p/google-code-prettify/
  [6]: http://highlightjs.org/
  [7]: http://bramp.github.io/js-sequence-diagrams/
  [8]: http://adrai.github.io/flowchart.js/

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