在jquery中,可以将所有复选框值转换为逗号分隔的字符串

$("#btn").click(() => {

    var chkValue = $(":checked").map((i,e) => e.value).toArray().join(",");
    console.log(chkValue)

});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="checkbox" id="vehicle1" name="vehicle1" value="Bike">
<label for="vehicle1"> I have a bike</label><br>
<input type="checkbox" id="vehicle2" name="vehicle2" value="Car">
<label for="vehicle2"> I have a car</label><br>
<input type="checkbox" id="vehicle3" name="vehicle3" value="Boat">
<label for="vehicle3"> I have a boat</label><br><br>

<hr/>
<button id=btn>click me</button>