CSS實現二維碼掃描的效果

掃描二維碼的效果，我原以為不好寫呢，后來想了想其實挺簡單的，幾行代碼，走起

<div class="code-bg">
    <div class="line"></div>
</div>

.code-bg{
		    position: relative; 
		    height: 200px; width: 200px; 
		    margin: 0px auto;/*此處為了居中*/
		    background: url(img/ewm1.jpg) center top no-repeat; /*二維碼*/
		}
		.line{ 
		    position: absolute; 
		    left: -80px; 
		    z-index: 2; 
		    height: 3px; width: 360px; 
		    background: url(img/share/dapai.png) no-repeat; /*上下掃的線*/
		    /*動畫效果*/
		    animation: myScan 1s infinite alternate; 
		    -webkit-animation: myScan 1s infinite alternate; 
		}
		@keyframes  myScan{
		    from { top:0px; }
		    to { top: 197px; }
		}
		-webkit-@keyframes  myScan{
		    from { top:0px; }
		    to { top: 197px; }
		}

　　我這里不方便截圖，那就這樣吧，是不是很簡單。這樣就實現了