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                            ①添加空盒子，缺點是為清除浮動，頁面會有很多空元素，造成代碼冗余。方法：在被浮動元素的后面（同級元素）添加空div類名為
```css
.clear {
    clear: both
}
```
②Overflow:hidden定義給父元素
③萬能清除法 ，代碼量大，但是兼容性最好。開發推薦使用。給浮動元素的父元素定義類名clear 
```css
.clear：after {
    display: block;
    clear: both;
    content: ""; 
    visibility:hidden;
    height: 0;
}

.clear {
    zoom: 1
}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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