我需要在jQuery脚本中添加什么，以便它也可以检测到CHECKED复选框。
基本上，在atm上，当有人输入正确的信息时，进度条将被填充。但是，复选框不会发生这种情况。
只需在名称输入字段中输入一些内容，您就会知道我的意思。
我使用了https://css-tricks.com/display-form/中的代码
progress {
width: 100%;
background: #333;
height: 20px;
border: 0;
}
::-webkit-progress-value {
transition: width 1s;
}<head><script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script></head>
<progress max="100" value="0" id="progress"></progress>
<div class="progress-message" id="progress-message">This form,it wants you.</div>
<form action="#" id="contactForm" method="post">
<input type="text" name="name" id="name" title="Name" value class="input-text reqyured-entry" placeholder="Your Name:" required="required" autocomplete="off" />
<input type="email" name="email" id="email" title="Email" value class="input-text required-entry validate-email" placeholder="Email Address:" required="required" pattern="^\S+@\S+\.\S+$" autocomplete="off" />
<input type="tel" name="telephone" id="telephone" title="Telephone" value class="input-text" placeholder="Telephone No:" required="required" min="11" pattern="[-+]?[0-9]*" autocomplete="off" />
<textarea type="text" name="comment" id="comment" title="Comment" class="required-entry input-text" placeholder="Type Your Message:" style="resize: vertical;" min="10" rows="7" required="required"></textarea>
<input type="checkbox" required="required" name="terms" id="terms"> I agree to the <a href="#"><u>Terms and Conditions</u></a><br><br>
<input type="submit" value="SEND" title="Submit" class="button"/>
</form>
</div>
</div>
<script>
$("#contactForm input,#contactForm textarea").keyup(function() {
var numValid = 0;
$("#contactForm input[required],#contactForm textarea[required]").each(function() {
if (this.validity.valid) {
numValid++;
}
});
var progress = $("#progress"),progressMessage = $("#progress-message");
if (numValid == 0) {
progress.attr("value","0");
progressMessage.text("This form,it wants you.");
}
if (numValid == 1) {
progress.attr("value","20");
progressMessage.text("There you go,great start!");
}
if (numValid == 2) {
progress.attr("value","40");
progressMessage.text("Nothing can stop you now.");
}
if (numValid == 3) {
progress.attr("value","60");
progressMessage.text("You're basically a hero,right?");
}
if (numValid == 4) {
progress.attr("value","80");
progressMessage.text("You're nearly there...");
}
if (numValid == 5) {
progress.attr("value","95");
progressMessage.text("SO CLOSE. PRESS THE THING.");
}
});
</script>