单选框
<form>
<input type="radio" name="fruits" value="apple" /> Apple
<br />
<input type="radio" name="fruits" value="orange" /> Orange
<br/>
<input type="radio" name="fruits" value="Bananas" /> Bananas
<br/>
<input type="radio" name="fruits" value="pear" /> Pear
</form>
<form>
<input type="radio" name="fruits" value="apple" /> Apple
<br />
<input type="radio" name="fruits" value="orange" /> Orange
<br/>
<input type="radio" name="fruits" value="Bananas" /> Bananas
<br/>
<input type="radio" name="fruits" value="pear" /> Pear
</form>