<div id=block3 >
<img id="wc_0" alt="播放节点" src="1.gif" alt="">
</div>
<button onclick="document.getElementById('wc_0').src = '2.gif'">换</button>
<img id="wc_0" alt="播放节点" src="1.gif" alt="">
</div>
<button onclick="document.getElementById('wc_0').src = '2.gif'">换</button>
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