javascript - JS: Hide random element within -


i have html:

<div class="all">   <div class="single">a</div>   <div class="single">b</div>   <div class="single">c</div> </div>  <div class="all">   <div class="single">a</div>   <div class="single">b</div>   <div class="single">c</div> </div>

i'd run javascript/jquery on page load shows random "single" div within each of "all" divs. if use code, found here, 1 of "single" divs shows between both of "all" divs apposed "single" div appear in each of "all" divs. 

var random = math.floor(math.random() * $('.single').length); $('.single').hide().eq(random).show();

i tried , failed write sort of loop cycles through instances of "all" , reveals 1 of "single" divs, no avail js skills extremely poor.

you can call code on each member of $('.all') collection:

$('.all').each(function() {    var random = math.floor(math.random() * $('.single', this).length);    $('.single', this).hide().eq(random).show();  });
.all {    margin-bottom: 1em;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div class="all">    <div class="single">a</div>    <div class="single">b</div>    <div class="single">c</div>  </div>    <div class="all">    <div class="single">a</div>    <div class="single">b</div>    <div class="single">c</div>  </div>


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