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                            ## 概述
DOM把元素抽象成對象,每一個屬性就是對象的屬性.

## 隱藏盒子
CSS
```
<style>
    div {
        height: 300px;
        width: 300px;
        background-color: orange;
    }

    .show{
        display: block;
    }

    .hidden{
        display: none;
    }
</style>
```
HTML
```
<input type="button" id="btn" value="隱藏">
<div id="box"></div>
```
JS
```
var btn = document.getElementById('btn');
var box = document.getElementById('box');

var btn = document.getElementById('btn');

var isShow = true
btn.onclick = function () {
    if (isShow) {
        box.className = 'hidden'    //這里的className 對應class ,因為js中class是關鍵字
        btn.value = '顯示';
        isShow = false;
    } else {
        box.className = 'show';
        btn.value = '隱藏' ;
        isShow = true;
    }
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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