import into the javascript frontend(html javascript)

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import into the javascript frontend(html javascript)

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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深蓝 · Answer 1 · 2021-10-06T19:23:20+0000

First frontend = browser, backend = nodejs. You surely mean that LowDB is available as a NodeJS module, which means it can be installed with NPM, either for frontend or backend development.

If you're not using NPM for your frontend development, you can still import modules with <script> tags.

Let's see an example using only HTML/javascript:

(from the doc):

<html>
    <head>
        <script src="https://unpkg.com/lodash@4/lodash.min.js"></script>
        <script src="https://unpkg.com/lowdb@0.17/dist/low.min.js"></script>
        <script src="https://unpkg.com/lowdb@0.17/dist/LocalStorage.min.js"></script>
    </head>
    <body>

        <button onclick="add()">Add Post</button>
        <button onclick="load()">Load Post</button>
        <div></div>
    </body>
    <script>
        var adapter = new LocalStorage('db')
        var db = low(adapter)
        db.defaults({ posts: [] })
            .write()
        function add() {
          // Data is automatically saved to localStorage
          db.get('posts')
            .push({ title: 'lowdb' })
            .write()
        }
        function load() {
          var div = document.querySelector('div')
          var text = div.innerText;
          text += db.get('posts').map(post=>post.title).join(';');
          div.innerText = text 
        }
    </script>

</html>

See this work: https://codepen.io/bcaure/pen/ExgBPBz

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