promise defer的使用方法

 const defer = () => {
    const def = {}
    def.promise = new Promise((resolve, reject) => {
        def.resolve = resolve
        def.reject = reject
    })

    return def
}
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<html>

<head>
    <title>defer promise</title>
    <style>
        .dialog {
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            display: flex;
            position: fixed;
            align-items: center;
            pointer-events: none;
            justify-content: center;
        }

        .dialog .mask {
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            position: absolute;
            opacity: 0;
            transition: 0.3s;
            background-color: rgba(0, 0, 0, 0.4);
        }

        .dialog-content {
            padding: 20px;
            transition: 0.2s;
            opacity: 0;
            transform: scale(0.95);
            background-color: #fff;
        }

        .dialog.visible {
            pointer-events: all;
        }

        .dialog.visible .mask {
            opacity: 1;
        }

        .dialog.visible .dialog-content {
            opacity: 1;
            transform: scale(1);
        }
    </style>
</head>

<body>
    <div class="container">
        <button id="control">show modal</button>
        <div class="dialog" id="dialog">
            <div class="mask" onclick="this.parentNode.classList.remove('visible')"></div>
            <div class="dialog-content">
                <input type="text" id="content" />
                <button id="confirm">sure</button>
            </div>
        </div>
    </div>

    <script>
        const defer = () => {
            const def = {}
            def.promise = new Promise((resolve, reject) => {
                def.resolve = resolve
                def.reject = reject
            })

            return def
        }

            ; (() => {
                const inputEl = document.getElementById('content')
                const dialogEl = document.getElementById('dialog')
                dialogEl.show = () => dialogEl.classList.add('visible')
                dialogEl.hide = () => dialogEl.classList.remove('visible')

                const dialogController = () => {
                    let dfd = null
                    const confirmBtn = document.getElementById('confirm')
                    confirmBtn.addEventListener('click', () => {
                        dialogEl.hide()
                        dfd.resolve(inputEl.value)
                    })

                    return () => {
                        dfd = defer()
                        dialogEl.show()
                        return dfd.promise
                    }
                }

                const openDialog = dialogController()
                const controlBtn = document.getElementById('control')
                controlBtn.addEventListener('click', async () => {
                    const message = await openDialog()
                    console.log('弹窗输入框信息：', message)
                })
            })()
    </script>
</body>

</html>
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原文地址：https://blog.csdn.net/weixin_42201346/article/details/125477771