javascript - 如何导入 Javascript 模块

Question

我正在尝试使用 http://spin.js.org/在我的网站上创建一个微调器，它在 AJAX 帖子触发时开始旋转并在完成时停止。不过，我正在努力让微调器正常工作。

我有一个节点应用程序，正在使用 EJS 进行模板化。在使用部分下，spin.js 的网站说:

import {Spinner} from 'spin.js';

var opts = {
  lines: 13, // The number of lines to draw
  length: 38, // The length of each line
  width: 17, // The line thickness
  radius: 45, // The radius of the inner circle
  scale: 1, // Scales overall size of the spinner
  corners: 1, // Corner roundness (0..1)
  color: '#ffffff', // CSS color or array of colors
  fadeColor: 'transparent', // CSS color or array of colors
  opacity: 0.25, // Opacity of the lines
  rotate: 0, // The rotation offset
  direction: 1, // 1: clockwise, -1: counterclockwise
  speed: 1, // Rounds per second
  trail: 60, // Afterglow percentage
  fps: 20, // Frames per second when using setTimeout() as a fallback in IE 9
  zIndex: 2e9, // The z-index (defaults to 2000000000)
  className: 'spinner', // The CSS class to assign to the spinner
  top: '50%', // Top position relative to parent
  left: '50%', // Left position relative to parent
  shadow: none, // Box-shadow for the lines
  position: 'absolute' // Element positioning
};

var target = document.getElementById('foo');
var spinner = new Spinner(opts).spin(target);

我不确定 import {Spinner} from 'spin.js' 应该去哪里？我已经搜索了很多，但一直没能找到如何实际实现它的方法。我找到了 this example of a jquery plugin for spin.js但我也在为那个而苦苦挣扎。任何帮助将不胜感激!

截至目前，这就是我所拥有的:

<div id="spinnerContainer" class="spinner" style="width:100px;height:100px;background-color: Gray; color:black;">
</div>

<script src="/scripts/spin.js/spin.js" type="text/javascript"></script>
<script>
    var opts = {
      lines: 20, // The number of lines to draw
      length: 0, // The length of each line
      width: 15, // The line thickness
      radius: 42, // The radius of the inner circle
      scale: 0.85, // Scales overall size of the spinner
      corners: 1, // Corner roundness (0..1)
      color: '#41d62b', // CSS color or array of colors
      fadeColor: 'transparent', // CSS color or array of colors
      opacity: 0.05, // Opacity of the lines
      rotate: 0, // The rotation offset
      direction: 1, // 1: clockwise, -1: counterclockwise
      speed: 1, // Rounds per second
      trail: 74, // Afterglow percentage
      fps: 20, // Frames per second when using setTimeout() as a fallback in IE 9
      zIndex: 2e9, // The z-index (defaults to 2000000000)
      className: 'spinner', // The CSS class to assign to the spinner
      top: '50%', // Top position relative to parent
      left: '50%', // Left position relative to parent
      shadow: 0, // Box-shadow for the lines
      position: 'absolute' // Element positioning
    };

    var target = document.getElementById('spinnerContainer');
    var spinner = new Spinner(opts).spin(target);
</script>

要在 spin.js 中加载的脚本正确地找到了文件，但随后我收到错误 Uncaught SyntaxError: Unexpected token export referenced the line export { Spinner }; 来自 spin.js

我还收到一条错误消息，提示 Uncaught ReferenceError: Spinner is not defined 我认为这与上述错误有关，但我不确定。

Answer 1

也许您只想使用 CDN version如果您没有设置管理导入

    var opts = {
      lines: 20, // The number of lines to draw
      length: 0, // The length of each line
      width: 15, // The line thickness
      radius: 42, // The radius of the inner circle
      scale: 0.85, // Scales overall size of the spinner
      corners: 1, // Corner roundness (0..1)
      color: '#41d62b', // CSS color or array of colors
      fadeColor: 'transparent', // CSS color or array of colors
      opacity: 0.05, // Opacity of the lines
      rotate: 0, // The rotation offset
      direction: 1, // 1: clockwise, -1: counterclockwise
      speed: 1, // Rounds per second
      trail: 74, // Afterglow percentage
      fps: 20, // Frames per second when using setTimeout() as a fallback in IE 9
      zIndex: 2e9, // The z-index (defaults to 2000000000)
      className: 'spinner', // The CSS class to assign to the spinner
      top: '50%', // Top position relative to parent
      left: '50%', // Left position relative to parent
      shadow: 0, // Box-shadow for the lines
      position: 'absolute' // Element positioning
    };

    var target = document.getElementById('spinnerContainer');
    var spinner = new Spinner(opts).spin(target);

<script src="https://cdnjs.cloudflare.com/ajax/libs/spin.js/2.3.2/spin.js"></script>
<div id="spinnerContainer" class="spinner" style="width:100px;height:100px;background-color: Gray; color:black;">
</div>