<form action="test.cgi"onsubmit="if(!chk1.checked){return false}">
<input type=checkbox id=chk1> You must check this before submit.<br>
<input type=submit>
</form>
<input type=checkbox id=chk1> You must check this before submit.<br>
<input type=submit>
</form>
解决方案 »
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