ES6 Arrow Function & this bug


    let accHeadings = document.querySelectorAll(`.accordionItemHeading`); // NodeList(3)
    // let accHeadings = [...document.querySelectorAll(`.accordionItemHeading`)];

    for (let i = 0; i < accHeadings.length; i++) {
        accHeadings[i].addEventListener("click", function(e) {
            console.log(`this`, this);
            console.log(`e.target`, e.target);
        });
    }
    for (let i = 0; i < accHeadings.length; i++) {
        // ES6 Arrow Function & this bug
        accHeadings[i].addEventListener("click", () => {
            console.log(`this`, this);
        }, false);
    }


<!DOCTYPE html>
<html lang="zh-Hans">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <meta name="author" content="xgqfrms">
    <meta name="generator" content="VS code">
    <title>ES6 Arrow Function & this bug</title>
</head>

<body>
    <section>
        <h1>ES6 Arrow Function & this bug</h1>
    </section>
    <section>
        <h2 class="accordionItemHeading">About accordions</h2>
        <h2 class="accordionItemHeading">Accordion items</h2>
        <h2 class="accordionItemHeading">How to use a JavaScript accordion</h2>
    </section>
    <section>
        <button class="btn">a</button>
        <button class="btn">b</button>
        <button class="btn">c</button>
    </section>
    <!-- js -->
    <script>
        let btns = [...document.querySelectorAll(`.btn`)];
        btns.forEach((acc) => {
            acc.addEventListener("click", function(e) {
                console.log(`this`, this);
                console.log(`e.target`, e.target);
            });
        });
        let accHeadings = [...document.querySelectorAll(`.accordionItemHeading`)];
        // for (let i = 0; i < accHeadings.length; i++) {
        //     accHeadings[i].addEventListener("click", function(e) {
        //         console.log(`this`, this);
        //         console.log(`e.target`, e.target);
        //     });
        // }
        for (let i = 0; i < accHeadings.length; i++) {
            // ES6 Arrow Function & this bug
            accHeadings[i].addEventListener("click", (e) => {
                console.log(`this`, this);
                console.log(`e.target`, e.target);
            });
        }
    </script>
</body>

</html>

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