看别人的代码，是个点击下面的图片代替上面的图片的特效里的代码.
<li class="roundabout-moveable-item" current-scale="0.7927" style="position: absolute; left: -60.1px; top: 80.4px; width: 512.0842px; height: 329.7632px; opacity: 1; z-index: 296; font-size: 10.31px;"><img src="images/slide5.jpg" alt=""></li>
请问current-scale是用来做什么的？
<li class="roundabout-moveable-item" current-scale="0.7927" style="position: absolute; left: -60.1px; top: 80.4px; width: 512.0842px; height: 329.7632px; opacity: 1; z-index: 296; font-size: 10.31px;"><img src="images/slide5.jpg" alt=""></li>
请问current-scale是用来做什么的？
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