Javascript 外部链接无效

Question

我观看了 this 两部分教程，了解如何使用 JavaScript 和 jQuery

编写真正高效的视差效果

当我将 JS 直接放入 html 文件时它可以完美地工作，但是当我在外部 link 它时，它不起作用。为什么？？

非工作版本：

(function ($) {

    var $container = $(".parallax");
    var $divs = $container.find("div.parallax-background");
    var thingBeingScroll = document.body;
    var liHeight = $divs.eq(0).closest("li").height();
    var diffHeight = $divs.eq(0).height() - liHeight;
    var len = $divs.length;

    var i, div, li, offset, scroll, top, transform;

    var offsets = $divs.get().map(function (div, d) {
        return $(div).offset();
    });

    var render = function () {

         top = thingBeingScroll.scrollTop;

         for (i = 0; i < len; i++) {
             div = $divs[i];

             offset = top - offsets[i].top;

             scroll = ~~((offset / liHeight * diffHeight) * 2);

             transform = 'translate3d(0px,' + scroll + 'px,0px)';

             div.style.webkitTransform = transform;
             div.style.MozTransform = transform;
             div.style.msTransform = transform;
             div.style.OTransform = transform;
             div.style.transform = transform;
         }
     };

     (function loop() {
         requestAnimationFrame(loop);
         render();
     })();

     (function () {
         var lastTime = 0;
         var vendors = ['webkit', 'moz'];
         for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
             window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
             window.cancelAnimationFrame =
               window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame'];
         }

         if (!window.requestAnimationFrame)
             window.requestAnimationFrame = function (callback, element) {
                 var currTime = new Date().getTime();
                 var timeToCall = Math.max(0, 16 - (currTime - lastTime));
                 var id = window.setTimeout(function () { callback(currTime + timeToCall); },
                   timeToCall);
                 lastTime = currTime + timeToCall;
                 return id;
             };

         if (!window.cancelAnimationFrame)
             window.cancelAnimationFrame = function (id) {
                 clearTimeout(id);
             };
     }());

 })(jQuery);

body, ul {
   margin: 0;
   padding: 0;
  }

  body {
   height: 2500px;
  }

  ul li {
   list-style: none;
   overflow: hidden;
   height: 600px;
  }

  .parallax-background {
   height: 700px;
   background-size: cover; 
  }

  .lens {
   background-image: url('http://www.cameraegg.org/wp-content/uploads/2013/04/sigma-art-lenses.jpg');
  }
  .beach {
   background-image: url('https://c1.staticflickr.com/3/2422/3799310645_92dba468ae_b.jpg');
  }
  .wolf {
   background-image: url('http://images.alphacoders.com/102/102853.jpg');
  }
  .flower {
   background-image: url('http://i.imgur.com/Aoo6BAk.jpg');
  }

  <ul class="parallax">
   <li>
    <div class="parallax-background flower"></div>
   </li>
  </ul>

  <h1>Content</h1>

Answer 1

您的 parallax.js 脚本和 parallax.css 的路径似乎无效：

<script src="parallax.js" type="parallax.js"></script> <!--Parallax JS-->
<link rel="stylesheet" type="text/css" href="parallax.css"> <!--Parallax CSS-->

转到这些 URL（通过单击 Chrome 中的 linked 文件）将我转到 Google 的登录页面。尝试更改您的脚本 src 和 link href 以使用绝对路径并确保两者对 public.

可见

Javascript 外部链接无效

Javascript linked externally not working

javascript

jquery

html

css

parallax