JQ 简单实现手风琴
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<div class="box">丫丫丫丫丫丫丫丫丫丫丫</div>
<div class="son">呸呸呸呸呸呸呸呸呸呸呸</div>
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<div class="box">飒飒飒飒飒飒飒飒飒飒飒</div>
<div class="son">青蛙青蛙青蛙青蛙青蛙青</div>
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<div class="box">打发打发打发打发打发打</div>
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<div class="box">龉龉龉龉龉龉龉龉龉龉龉</div>
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