my_docs/test.html at main · fancy-yu/my_docs · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div class="test">aaaaaaaa</div>
    <script>
        const test = document.querySelector('.test')
        let trigger = {}
        const t = new Proxy(trigger,{
            set(){
                events.forEach(event=>event())
                return true
            }
        })
        const events = new Set()
        test.onclick = function(){
            console.log('old')
        }
        test.onclick = function collector(fn) {
            const oldEvent = test.onclick;
            oldEvent  && events.add(oldEvent)
            return function (traverse) {
                events.add(fn.bind(this))
                Promise.resolve().then(()=>t.trigger = true)
            };
        }(function(){console.log('new1')})

        test.onclick = function collector(fn) {
            const oldEvent = test.onclick;
            oldEvent  && events.add(oldEvent)
            return function (traverse) {
                events.add(fn.bind(this))
                Promise.resolve().then(()=>t.trigger = true)
            };
        }(function(){console.log('new2')})


    </script>
</body>

</html>