Question

以下代码在this jsbin中正常运行，但在this codepen，this plunker或this jsfiddle中无效。

为什么不呢？我怎样才能让它在三个不适合的地方工作？

http://jsbin.com/yudavucola/1/edit?html,console,output

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>

  <base href="http://polygit.org/polymer+:master/components/">
  <script src="webcomponentsjs/webcomponents-lite.js"></script>
  <link rel="import" href="polymer/polymer-element.html">
  <link rel="import" href="paper-dialog/paper-dialog.html">

  <!-- Ensure Web Animations polyfill is loaded since neon-animation 2.0 doesn't import it -->
  <link rel="import" href="neon-animation/web-animations.html">
  <link rel="import" href="neon-animation/animations/scale-up-animation.html">
  <link rel="import" href="neon-animation/animations/fade-out-animation.html">

</head>
<body>
  <dom-module id="my-el">
    <template>
      <button on-click="open">Open Dialog</button>
      <paper-dialog
        id="dialog"
        entry-animation="scale-up-animation"
        exit-animation="fade-out-animation"
        modal
       >
        <h2>Header</h2>
        <div>Dialog body</div>
      </paper-dialog>
    </template>
    <script>
      class MyEl extends Polymer.Element {
        static get is() { return 'my-el' }

    constructor() {
      super();
        }

        open() {
          console.log('opening...');
          this.$.dialog.open();
          console.log('opened!');
        }

      }

      customElements.define(MyEl.is, MyEl);
    </script>
  </dom-module>

  <my-el></my-el>
</body>
</html>

Answer 1

由于 jsbin 以外的其他所有网站都使用HTTP的安全版本，即HTTPS，因此从源http://polygit.org/polymer+:master/components/获取内容的请求是受阻。因此，使用安全连接，它将在每个其他站点中工作。

您可以查看控制台以获取更多信息。

Answer 2

将<base>代码的href属性从http://polygit.org/...更改为//polygit.org/...。这会将导入规范化为http和https环境。

以下是所有存储库中的工作示例：JsBin，Codepen，Plunker和JsFiddle。

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>

  <base href="//polygit.org/polymer+:master/components/">
  <script src="webcomponentsjs/webcomponents-lite.js"></script>
  <link rel="import" href="polymer/polymer-element.html">
  <link rel="import" href="paper-dialog/paper-dialog.html">

  <!-- Ensure Web Animations polyfill is loaded since neon-animation 2.0 doesn't import it -->
  <link rel="import" href="neon-animation/web-animations.html">
  <link rel="import" href="neon-animation/animations/scale-up-animation.html">
  <link rel="import" href="neon-animation/animations/fade-out-animation.html">

</head>
<body>
  <dom-module id="my-el">
    <template>
      <button on-click="open">Open Dialog</button>
      <paper-dialog
        id="dialog"
        entry-animation="scale-up-animation"
        exit-animation="fade-out-animation"
        modal
       >
        <h2>Header</h2>
        <div>Dialog body</div>
      </paper-dialog>
    </template>
    <script>
      class MyEl extends Polymer.Element {
        static get is() { return 'my-el' }

    constructor() {
      super();
        }

        open() {
          console.log('opening...');
          this.$.dialog.open();
          console.log('opened!');
        }

      }

      customElements.define(MyEl.is, MyEl);
    </script>
  </dom-module>

  <my-el></my-el>
</body>
</html>

修改

请注意，对于特定版本的Polymer，您可以使用

<base href="//polygit.org/polymer2.0+:master/components/">

或

<base href="//polygit.org/polymer1.0+:master/components/">

等

Polymer 2.x代码在jsbin中工作，但在codepen，plunker或jsfiddle中不起作用

2 个答案: