Scrollspy Ukit 3 框架和计数

问题描述

我是前端的初学者，对我来说 javascript 很难 :( 我想使用组件 scrollspy uikit 3 计算数字而不使用 jquery https://getuikit.com/docs/scrollspy 我是这样制作的，但它不起作用

<span id="number"></span>
    <script>
        UIkit.scrollspy('#number','inview',function () {
            const countUp = new CountUp('number',1000 );
            countUp.start();
        });
    </script>

解决方法

我为此创建了一个脚本。

var util = UIkit.util;
var el = util.$('#heading');
var textIndex = 0;
UIkit.scrollspy(el,{repeat: true,delay: 100});
  
util.on(el,'inview',function (){
 function counter( start,end,duration) {
  let current = start,range = end - start,increment = end > start ? 1 : -1,step = Math.abs(Math.floor(duration / range)),timer = setInterval(() => {
    current += increment;
    el.textContent = current;
    if (current == end) {
     clearInterval(timer);
    }
   },step);
 }
  counter(0,100,3000);
});

util.on(el,'outview',function(){
  el.textContent = 0;
});

<!-- UIkit CSS -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/uikit@3.6.22/dist/css/uikit.min.css" />

<!-- UIkit JS -->
<script src="https://cdn.jsdelivr.net/npm/uikit@3.6.22/dist/js/uikit.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/uikit@3.6.22/dist/js/uikit-icons.min.js"></script>

<section class="uk-section uk-section-primary" uk-height-viewport="offset-top: true">
  <div class="uk-container">
    <div class="uk-text-center">
    <h1 >SECTION 1</h1>
      <a href="https://codepen.io/bilashism/pen/mZpZLx" target="_blank">Source Code for Number Increment</a>
    </div>
    <div class="uk-text-center uk-margin-medium-top">
      <a class="uk-link-reset" href="#section" uk-scroll>Scroll</a>
    </div>
  </div>
</section>
<section class="uk-section uk-section-secondary" id="section">
  <div class="uk-container">
    <h1 class="uk-text-center" id="heading">0</h1>
  </div>
</section>

您需要监听 inview 和 outview 事件。方法如下：

UIkit.util.on(element,'event',function(){
   //your code will be here here
});