javascript - 单个滚动部分的动画

Question

在此处查看完整代码 http://codepen.io/anon/pen/jWQOxa

在上面的 codepen 中，我试图将动画应用于不同的滚动部分。但是当我打开应用程序时，所有单独的部分都会同时执行动画。它不会等到它真正进入用户的视野。所以我想应用相同的动画并使其仅在进入用户 View 时执行。请让我知道我怎样才能做到这一点。提前致谢!

HTML5:

   <div class="navbar-fixed">
    <nav>
     <div class="nav-wrapper light-blue darken-4">
      <a href="#" class="brand-logo">hallo</a>
      <a href="#" data-activates="mobile-demo" class="button-collapse"><i class="material-icons">menu</i></a>
       <ul class="right hide-on-med-and-down section table-of-contents">
          <li><a href="#about" style="color:#">About Us</a></li>
          <li><a href="#features" style="color:">Features</a></li>
          <li><a href="#team" style="color:">Our Team</a></li>
          <li><a href="#contact" style="color:">Contact Us</a></li>
        </ul>

   <div class="aboutanimate" id="about">
    <h1>Watch me move-1</h1>
      <p>
        This example shows how to use CSS animations to make <code>H1</code>
         elements move across the page.
      </p>
       <p>In addition, we output some text each time an animation event fires,so you can see them in action.</p>
    </div>

  <div class="featuresanimate" id="features">
     <h1>Watch me move-2</h1>
       <p>This example shows how to use CSS animations to make   <code>H1</code>elements move across the page.</p>
       <p>In addition, we output some text each time an animation event   fires,so you can see them in action.</p>
  </div>

CSS:

  .aboutanimate,.featuresanimate,.teamanimate,.contactanimate {
    animation-duration: 1s;
    animation-name: slidein;
}

@keyframes slidein {
    from {
        margin-left: 100%;
        width: 300%; 
    }
    to {
        margin-left: 0%;
        width: 100%;
    }
}

Answer 1

我有快速破解解决方案而不是这么长的解决方案。我用过 animate.css 和 wow.js。这正如预期的那样有效。 你可以在这里看到一个例子: http://codepen.io/anon/pen/obJqqm

      <div class="row" >
        <div class="aboutanimate">
          <div id="about" class="section scrollspy">
            <div class="container">
               <h2 class="wow animated shake" style="text-decoration:underline;text-align:center;font-weight:bold;font-family:Comic Sans MS">About Us</h2><br><br>
               <div class="quot animated shake">
                 <h5 style="color:#446CB3;padding-top:30px;text-decoration:underline;font-weight:bold;font-size:35px;font-family:Comic Sans MS">Vision</h5>
                  <p id="vision">"Lorem ipsem Lorem ipsemLorem ipsemLorem ipsemLorem ipsemLorem ipsem</p>
                  <h5 style="color:#446CB3;text-decoration:underline;font-weight:bold;font-size:35px;font-family:Comic Sans MS">Mission</h5>
                  <p id="vision">"Lorem ipsemLorem ipsemLorem ipsemLorem ipsemLorem ipsemLorem ipsem"</p>
                  <h5 style="color:#446CB3;text-decoration:underline;font-weight:bold;font-size:35px;font-family:Comic Sans MS">Objectives</h5>
                  <p id="vision">"Lorem ipsemLorem ipsemLorem ipsemLorem ipsemLorem ipsemLorem ipsemLorem ipsem"</p><br><br><br>
                  </div>
                </div>
             </div>
         </div><br><br>