简单的jq滑块通过位置

尝试使用标志并在每个相应的处理程序(如(中设置它们

$(function() {
  var slideWidth = $('#slider ul li').width();
  var next = true;
  var prev = false;
  $('a.control_next').click(function() {
    if (next) {
      $('ol > li:first-child > a').removeClass('active');
      $('ol > li:last-child > a').removeClass('control_next');
      $('ol > li:first-child > a').addClass('control_prev');
      $('ol > li:last-child > a').addClass('active');
      $('#anim').animate({
        left: "-=920",
      }, 500, function() {});
      next = false;
      prev = true;
    }
  });
  $('a.control_prev').click(function() {
    if (prev) {
      $('ol > li:last-child > a').removeClass('active');
      $('ol > li:last-child > a').addClass('control_next');
      $('ol > li:first-child > a').addClass('active');
      $('ol > li:first-child > a').removeClass('control_prev');
      $('#anim').animate({
        left: "+=920",
      }, 500, function() {})
    }
    next = true;
    prev = false;
  });
});

#slider {
  overflow: hidden;
  padding-left: 0;
  padding-right: 0;
}
#slider ul {
  position: absolute;
  overflow: hidden;
  width: 1000%;
  margin: 0;
  padding: 0;
  height: 200px;
  list-style: none;
}
#slider ul li {
  float: left;
  width: 920px;
}
ol {
  margin: 200px auto 0 auto;
  padding: 30px 20px;
  list-style: none;
  bottom: 0px;
  text-align: center;
}
ol > li {
  margin: 0 6px;
  display: inline-block;
}
ol > li > a {
  width: 11px;
  height: 11px;
  display: block;
  background: #f7f7f7;
  cursor: pointer;
  border-radius: 20px;
  box-shadow: inset 0 0 3px #a9afb3;
}
ol > li > a:hover:not(.active) {
  background: #333;
  -webkit-transition: all 250ms ease-out;
  -moz-transition: all 250ms ease-out;
  -o-transition: all 250ms ease-out;
  transition: all 250ms ease-out;
}
ol > li > a.active {
  background: #a9afb3;
  cursor: default;
  -webkit-transition: all 250ms ease-out;
  -moz-transition: all 250ms ease-out;
  -o-transition: all 250ms ease-out;
  transition: all 250ms ease-out;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="slider" class="block">
  <ul id="anim">
    <li>
      <h2 class="twitter">AOS New York @aod</h2>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Fugit, sint! Accusamus rem molestias facilis, aliquid. Eum facere adipisci, minus ullam, quis quam eaque quia at recusandae vel veniam sint, veritatis.</p>
    </li>
    <li>
      <h2 class="twitter">AOS New York @aod</h2>
      <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Fugit, sint! Accusamus rem molestias facilis, aliquid. Eum facere adipisci, minus ullam, quis quam eaque quia at recusandae vel veniam sint, veritatis.</p>
    </li>
  </ul>
  <ol>
    <li><a class="control_prev active">&nbsp;</a>
    </li>
    <li><a class="control_next">&nbsp;</a>
    </li>
  </ol>
</div>