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                            ## 概述
可以在元素中自定義元素的屬性,來進行一些標記.

## 不能使用下面的方式獲取自定義屬性
會報undefined
```
<body>
    <div id="box" age=10></div>

<script>
    var box = document.getElementById('box');
    console.log(box.age);
</script>
```

## 獲取自定義屬性
```
<body>
    <div id="box" age=10></div>

<script>
    var box = document.getElementById('box');
    console.log(box.getAttribute('age'));    //使用這種方式可以獲取自定義屬性的值,這種是標準方式
</script>
```

## 設置自定義屬性
```
box.setAttribute('age',100);       //通過這種方式設置自定義屬性,不僅可以設置自定義屬性
```
## 刪除屬性

```
box.removeAttribute('age');
```

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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