这样写可以吗?
<label for="1">慢跑</label>
<input type="checkbox" name="1" id="1" />
<br />
<label for="2">登山</label>
<input type="checkbox" name="2" id="2" />
<br />
<label for="3">篮球</label>
<input type="checkbox" id="3" placeholder="3">
<label for="1">慢跑</label>
<input type="checkbox" name="1" id="1" />
<br />
<label for="2">登山</label>
<input type="checkbox" name="2" id="2" />
<br />
<label for="3">篮球</label>
<input type="checkbox" id="3" placeholder="3">
2016-07-13
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