选择复选框时清除按钮的disable属性
<input type="checkbox" id="checkbox" name="" value=""/>我已阅读并接受该条款内容
<input type="submit" id="submit" value="立即注册" disabled="disabled" />
<script type="text/javascript">
$('#checkbox').click(function({$('#submit').removeAttr("disabled");});
</script>