javascript - 使用 jquery 计算特定元素并向类名添加计数

Question

如何使用 jquery 计算具有特定类的元素的数量并将计数作为新类名添加到每个元素？

$('.full-screen').each(function(i) {
    $(this).addClass('.full-screen-', i);
});

我要创建:

<div class="full-screen full-screen-1"></div>
<div class="full-screen full-screen-2"></div>
<div class="full-screen full-screen-3"></div>
<div class="full-screen full-screen-4"></div>
<div class="full-screen full-screen-5"></div>

Answer 1

您也可以使用 .addClass( function )而不是使用 .each()

$('.full-screen').addClass(function(i) {
    return 'full-screen-'+(i+1);
});

$('.full-screen').addClass(function(i) {
    return 'full-screen-'+(i+1);
});
console.log($('.full-screen'))

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="full-screen"></div>
<div class="full-screen"></div>
<div class="full-screen"></div>
<div class="full-screen"></div>
<div class="full-screen"></div>