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                            # prototype

## 定義和用法

prototype 屬性使您有能力向對象添加屬性和方法。

### 語法

```
<pre class="calibre13">```
object<span class="token1">.</span>prototype<span class="token1">.</span>name<span class="token">=</span>value

```
```

## 實例

在本例中，我們將展示如何使用 prototype 屬性來向對象添加屬性：

```
<pre class="calibre13">```
<span class="token"><</span>script type<span class="token">=</span><span class="token4">"text/javascript"</span><span class="token">></span>

<span class="token2">function</span> <span class="token3">employee</span><span class="token1">(</span>name<span class="token1">,</span>job<span class="token1">,</span>born<span class="token1">)</span>
<span class="token1">{</span>
<span class="token2">this</span><span class="token1">.</span>name<span class="token">=</span>name<span class="token1">;</span>
<span class="token2">this</span><span class="token1">.</span>job<span class="token">=</span>job<span class="token1">;</span>
<span class="token2">this</span><span class="token1">.</span>born<span class="token">=</span>born<span class="token1">;</span>
<span class="token1">}</span>

<span class="token2">var</span> bill<span class="token">=</span><span class="token2">new</span> <span class="token3">employee</span><span class="token1">(</span><span class="token4">"Bill Gates"</span><span class="token1">,</span><span class="token4">"Engineer"</span><span class="token1">,</span><span class="token5">1985</span><span class="token1">)</span><span class="token1">;</span>

employee<span class="token1">.</span>prototype<span class="token1">.</span>salary<span class="token">=</span><span class="token2">null</span><span class="token1">;</span>
bill<span class="token1">.</span>salary<span class="token">=</span><span class="token5">20000</span><span class="token1">;</span>

document<span class="token1">.</span><span class="token3">write</span><span class="token1">(</span>bill<span class="token1">.</span>salary<span class="token1">)</span><span class="token1">;</span>

<span class="token"><</span><span class="token">/</span>script<span class="token">></span>


```
```

輸出：

```
<pre class="calibre14">```
<span class="token5">20000</span>

```
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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