目录树添加模型，和透明度调整的相关结构及逻辑样式

shuishen

2021-06-09 0ee58233d6e1ab07bc13701f12b60be8dcf9aff7

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<div class="Volume" dojoAttachEvent="mousedown:onShowVolume">
    <div class="VolumeSlider" dojoAttachPoint="volumeSlider">
        <div class="VolumeSliderBack" dojoAttachPoint="volumeSliderBack"></div>
        <div class="VolumeSliderHandle" dojoAttachPoint="handle" dojoAttachEvent="mousedown:startDrag, mouseup:endDrag, mouseover:handleOver, mouseout:handleOut"></div>    
    </div>
    <div class="icon"></div>
</div>