reactive-example/index.html at master · art-wit/reactive-example · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div>
    <input id="input-text" type="text">
    <div id="div-text">Hello, ???</div>
  </div>
  <script>
    class ReactiveVar {

      value;

      depend = new Dependency();

      get(){
        this.depend.depend();
        return this.value;
      }

      set(value){
        this.value = value;
        this.depend.changed();
      }
    };

    class Dependency {

      autorunList = [];

      depend(){
        Tracker.current&&this.autorunList.push(Tracker.current)
      }

      changed(){
        this.autorunList.forEach(fn => {
          fn()
        })
      }

    };

    const Tracker = {
      autorun(fn){
        const old = this.current;
        this.current = fn;
        fn();
        this.current = old;
      },
      nonreactive(fn){
        const old = this.current;
        this.current = null;
        const value = fn();
        this.current = old;
        return value;
      },
      current: null,
    }
  </script>
  <script>
    const name = new ReactiveVar();
    const time = new ReactiveVar();
    const rand = new ReactiveVar();
  </script>
  <script>
    const input = document.getElementById('input-text');
    input.addEventListener('input', ()=>{
      name.set(input.value);
    });
    setInterval(() => {
      time.set(new Date());
    }, 1000);
    setInterval(() => {
      rand.set(Math.floor(Math.random()*1000))
    }, 1000);
  </script>


  <script>
    Tracker.autorun(() => {
      // const num = Tracker.nonreactive(()=>rand.get());
      const num = rand.get();
      // Tracker.autorun(() => {
        const div = document.getElementById('div-text');
        div.innerText = `Hello, ${name.get()}, ${num}`;
        console.log('render');
      // })
    });
  </script>
  <script>
    Tracker.autorun(() => {
      document.title = `Hi, ${name.get()}`;
    });
  </script>
  <script>
    Tracker.autorun(() => {
      console.log(name.get());
    });
    name.set('Artem');
  </script>
</body>
</html>