javascript - 无法在图像 slider 中的点上设置圆形边框

Question

我使用了 Codepen 的幻灯片 https://codepen.io/dfitzy/pen/xZqGVo但我无法更改这些点来更改幻灯片。我想在点周围添加黑色边框。当我尝试它时，它会变成矩形。为了节省您的时间，这是带有点“a.slide_btn”的类。我知道的很少，但我无法弄清楚是什么。

$('.slider').each(function() {
  var $this = $(this);
  var $group = $this.find('.slide_group');
  var $slides = $this.find('.slide');
  var bulletArray = [];
  var currentIndex = 0;
  var timeout;
  
  function move(newIndex) {
    var animateLeft, slideLeft;
    
    advance();
    
    if ($group.is(':animated') || currentIndex === newIndex) {
      return;
    }
    
    bulletArray[currentIndex].removeClass('active');
    bulletArray[newIndex].addClass('active');
    
    if (newIndex > currentIndex) {
      slideLeft = '100%';
      animateLeft = '-100%';
    } else {
      slideLeft = '-100%';
      animateLeft = '100%';
    }
    
    $slides.eq(newIndex).css({
      display: 'block',
      left: slideLeft
    });
    $group.animate({
      left: animateLeft
    }, function() {
      $slides.eq(currentIndex).css({
        display: 'none'
      });
      $slides.eq(newIndex).css({
        left: 0
      });
      $group.css({
        left: 0
      });
      currentIndex = newIndex;
    });
  }
  
  function advance() {
    clearTimeout(timeout);
    timeout = setTimeout(function() {
      if (currentIndex < ($slides.length - 1)) {
        move(currentIndex + 1);
      } else {
        move(0);
      }
    }, 4000);
  }
  
  $('.next_btn').on('click', function() {
    if (currentIndex < ($slides.length - 1)) {
      move(currentIndex + 1);
    } else {
      move(0);
    }
  });
  
  $('.previous_btn').on('click', function() {
    if (currentIndex !== 0) {
      move(currentIndex - 1);
    } else {
      move(3);
    }
  });
  
  $.each($slides, function(index) {
    var $button = $('<a class="slide_btn">&bull;</a>');
    
    if (index === currentIndex) {
      $button.addClass('active');
    }
    $button.on('click', function() {
      move(index);
    }).appendTo('.slide_buttons');
    bulletArray.push($button);
  });
  
  advance();
});

html, body {
  background: #F7F5E6;
  height: 100%;
  margin: 0;
  padding: 0;
  width: 100%;
}

.slider {
  margin: 0 auto;
width:100%;
  height:100%;
}

.slide_viewer {
  height:100%;
  height: 340px;
  overflow: hidden;
  position: relative;
}

.slide_group {
  
  height: 100%;
  position: relative;
  width: 100%;
}

.slide {
  display: none;
  height: 100%;
  position: absolute;
  width: 100%;
}

.slide:first-child {
  height:100%;
  display: block;
}

.slide:nth-of-type(1) {
  height:100%;
  background: #D7A151;
}

.slide:nth-of-type(2) {
  height:100%;
  background: #F4E4CD;
}

.slide:nth-of-type(3) {
  background: #C75534;
}

.slide:nth-of-type(4) {
  height:100%;
  background: #D1D1D4;
}

.slide_buttons {
  left: 0;
  position: absolute;
  right: 0;
  text-align: center;
}

a.slide_btn {
  color: #474544;
  font-size: 42px;
  margin: 0 0.175em;
  -webkit-transition: all 0.4s ease-in-out;
  -moz-transition: all 0.4s ease-in-out;
  -ms-transition: all 0.4s ease-in-out;
  -o-transition: all 0.4s ease-in-out;
  transition: all 0.4s ease-in-out;
}

.slide_btn.active, .slide_btn:hover {
  color: #428CC6;
  cursor: pointer;
}

.directional_nav {
  height: 340px;
  margin: 0 auto;
  max-width: 940px;
  position: relative;
  top: -340px;
}

.previous_btn {
  bottom: 0;
  left: 100px;
  margin: auto;
  position: absolute;
  top: 0;
}

.next_btn {
  bottom: 0;
  margin: auto;
  position: absolute;
  right: 100px;
  top: 0;
}

.previous_btn, .next_btn {
  cursor: pointer;
  height: 65px;
  opacity: 0.5;
  -webkit-transition: opacity 0.4s ease-in-out;
  -moz-transition: opacity 0.4s ease-in-out;
  -ms-transition: opacity 0.4s ease-in-out;
  -o-transition: opacity 0.4s ease-in-out;
  transition: opacity 0.4s ease-in-out;
  width: 65px;
}

.previous_btn:hover, .next_btn:hover {
  opacity: 1;
}

@media only screen and (max-width: 767px) {
  .previous_btn {
    left: 50px;
  }
  .next_btn {
    right: 50px;
  }
}

<div class="slider">
  <div class="slide_viewer">
    <div class="slide_group">
      <div class="slide">
      </div>
      <div class="slide">
      </div>
      <div class="slide">
      </div>
      <div class="slide">
      </div>
    </div>
  </div>
</div><!-- End // .slider -->

<div class="slide_buttons">
</div>
</div><!-- End // .directional_nav -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>

Answer 1

其实里面用到的圆圈都是类似字母的符号。当您为 a.slide_btn 提供边框时，它基本上只是为 a 提供边框，它是字母(符号)的容器。实际上你有两种方法，第一种方法是以 svg 格式绘制自定义圆圈，就像 slider 中使用的下一个和上一个按钮一样。但是如果你想要一些简单的东西，你可以给包含那个圆圈的 a.slide_btn 文本阴影。

a.slide_btn {
  color: #428CC6;
  font-size: 200px;
  text-shadow: -2px 0 black, 0 2px black, 2px 0 black, 0 -2px black;
}

<a class="slide_btn">•</a>