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                            ## 透視
電腦顯示器是一個 2D平面,圖像之所以具有立體感(3D效果),其實只是一種視覺呈現,通過透視可以實現此目的.透視可以將一個2D平面,在轉換的過程中,呈現3D效果.

    透視原理:近大遠小.
    瀏覽器透視:把近大遠小的所有圖像,透視在屏幕上.
    perspective:視距,表示視點距屏幕的長短.視點,用于模擬透視效果時人眼的位置.
注:并非任何情況下需要透視效果,根據開發需要進行設置.
perspective一般作為一個屬性,設置給父元素,作用域所有3D轉換的子元素.

perspsctive要加載父元素上面. 數值越小,效果越明顯.
```
    <style>
        body{
            perspective: 300px;
        }

        img {
            display: block;
            width: 200px;
            height: 200px;
            margin:  0 auto ;
            transition: all 5s;
            box-shadow: 0px 10px 10px;
        }

        img:hover{
            transform: rotateY(180deg);
        }
    </style>
</head>
<body>
    <div>
        <img src="1.jpg" alt="">
    </div>
</body>
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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