async load img.html

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta
            name="viewport"
            content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"
        />
        <meta http-equiv="X-UA-Compatible" content="ie=edge" />
        <title>使用promise实现图片异步加载状态判断</title>
    </head>
    <body>
        <h2>使用promise实现图片异步加载状态判断</h2>
        <script>
            function loadImageAsync(i, url) {
                const promise = new Promise((resolve, reject) => {
                    const image = new Image();
                    image.src = url;
                    image.onload = function() {
                        resolve();
                    };
                    image.onerror = function() {
                        reject(new Error('Could not load image at ' + url));
                    };
                });
                promise
                    .then(() => {
                        this.productList[i].isLoadImg = true;
                    })
                    .catch(err => {
                        console.log(err);
                    });
            }
        </script>
    </body>
</html>