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                            # less

- 變量

```
<pre class="calibre14">```
@fontsize<span class="token2">:</span><span class="token3">12</span>px<span class="token2">;</span>

@mySelector<span class="token2">:</span> banner<span class="token2">;</span>
<span class="token2">.</span>@<span class="token2">{</span>mySelector<span class="token2">}</span> <span class="token2">{</span>
  font<span class="token">-</span>weight<span class="token2">:</span> bold<span class="token2">;</span>
  line<span class="token">-</span>height<span class="token2">:</span> <span class="token3">40</span>px<span class="token2">;</span>
  margin<span class="token2">:</span> <span class="token3">0</span> auto<span class="token2">;</span>
<span class="token2">}</span>

```
```

- 混入

```
<pre class="calibre14">```
<span class="token2">.</span><span class="token1">mixin</span><span class="token2">(</span><span class="token2">)</span> <span class="token2">{</span>
 width<span class="token2">:</span>  <span class="token3">100</span><span class="token">%</span><span class="token2">;</span>
 height<span class="token2">:</span> <span class="token3">200</span>px<span class="token2">;</span>
<span class="token2">}</span>
<span class="token2">.</span>c<span class="token2">{</span>
<span class="token2">.</span><span class="token1">mixin</span><span class="token2">(</span><span class="token2">)</span><span class="token2">;</span>
<span class="token2">}</span>

```
```

- 引用父類

```
<pre class="calibre14">```
a <span class="token2">{</span>
 color<span class="token2">:</span> blue<span class="token2">;</span>
 <span class="token">&</span><span class="token2">:</span>hover <span class="token2">{</span>
   color<span class="token2">:</span> green<span class="token2">;</span>
 <span class="token2">}</span>
<span class="token2">}</span>

```
```

```
<pre class="calibre14">```
 <span class="token2">.</span>clearfix <span class="token2">{</span>
  display<span class="token2">:</span> block<span class="token2">;</span>
  zoom<span class="token2">:</span> <span class="token3">1</span><span class="token2">;</span>
  <span class="token">&</span><span class="token2">:</span>after <span class="token2">{</span>
    content<span class="token2">:</span> <span class="token4">" "</span><span class="token2">;</span>
    display<span class="token2">:</span> block<span class="token2">;</span>
    font<span class="token">-</span>size<span class="token2">:</span> <span class="token3">0</span><span class="token2">;</span>
    height<span class="token2">:</span> <span class="token3">0</span><span class="token2">;</span>
    clear<span class="token2">:</span> both<span class="token2">;</span>
    visibility<span class="token2">:</span> hidden<span class="token2">;</span>
  <span class="token2">}</span>
<span class="token2">}</span>

```
```

輸出

```
<pre class="calibre16">```
<span class="token2">.</span>clearfix <span class="token2">{</span>
  display<span class="token2">:</span> block<span class="token2">;</span>
  zoom<span class="token2">:</span> <span class="token3">1</span><span class="token2">;</span>
<span class="token2">}</span>
<span class="token2">.</span>clearfix<span class="token2">:</span>after <span class="token2">{</span>
  content<span class="token2">:</span> <span class="token4">" "</span><span class="token2">;</span>
  display<span class="token2">:</span> block<span class="token2">;</span>
  font<span class="token">-</span>size<span class="token2">:</span> <span class="token3">0</span><span class="token2">;</span>
  height<span class="token2">:</span> <span class="token3">0</span><span class="token2">;</span>
  clear<span class="token2">:</span> both<span class="token2">;</span>
  visibility<span class="token2">:</span> hidden<span class="token2">;</span>
<span class="token2">}</span>

```
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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