前端每日實戰：87# 視頻演示如何用 1 個 DOM 元素和純 CSS 創做一臺對開門冰箱

效果預覽

按下右側的「點擊預覽」按鈕能夠在當前頁面預覽，點擊連接能夠全屏預覽。

https://codepen.io/comehope/pen/EpWagM

可交互視頻

此視頻是能夠交互的，你能夠隨時暫停視頻，編輯視頻中的代碼。

請用 chrome, safari, edge 打開觀看。

https://scrimba.com/p/pEgDAM/cZwGRTL

源代碼下載

每日前端實戰系列的所有源代碼請從 github 下載：

https://github.com/comehope/front-end-daily-challenges

代碼解讀

定義 dom，只有 1 個元素：

<div class="fridge"></div>

居中顯示：

body {
    margin: 0;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(floralwhite, wheat);
}

定義容器尺寸：

.fridge {
    width: 24em;
    height: 38em;
    font-size: 10px;
}

畫出冰箱的輪廓：

.fridge {
    border-top: 1em solid #333;
    border-bottom: 1em solid #333;
    background: silver;
    border-radius: 4em / 0.5em;
    box-shadow: 0 0.5em 1em -0.5em rgba(0, 0, 0, 0.5);
}

用線性漸變畫出冰箱的金屬表面：

.fridge {
    background:
        linear-gradient(
            to right,
            darkgray,
            lightgray 10%,
            silver 40%, silver 80%,
            darkgray 90%,
            dimgray
        );
}

再用線性漸變畫出冰箱的把手：

.fridge {
    background:
        linear-gradient(
            to right,
            transparent 40%,
            gray 40%,
            silver 41%,
            dimgray 43%,
            transparent 43%, transparent 48%,
            gray 48%,
            silver 49%,
            dimgray 51%,
            transparent 51%
        ) no-repeat center / 100% 90%, /* handles */
        linear-gradient(
            to right,
            darkgray,
            lightgray 10%,
            silver 40%, silver 80%,
            darkgray 90%,
            dimgray
        );
}

在冰箱表面的線性漸變中加畫門縫：

.fridge {
    background:
        linear-gradient(
            to right,
            transparent 40%,
            gray 40%,
            silver 41%,
            dimgray 43%,
            transparent 43%, transparent 48%,
            gray 48%,
            silver 49%,
            dimgray 51%,
            transparent 51%
        ) no-repeat center / 100% 90%, /* handles */
        linear-gradient(
            to right,
            darkgray,
            lightgray 10%,
            silver 40%, silver 45%,
            black 45%, black 46%,
            silver 46%, silver 80%,
            darkgray 90%,
            dimgray
        );
}

用 before 僞元素畫出飲水機的輪廓：

.fridge::before {
    content: '';
    position: absolute;
    width: 6em;
    height: 7.5em;
    background: black;
    top: calc((100% - 7.5em) / 2);
    left: 2.5em;
}

用線性漸變畫出飲水機的擋板，用徑向漸變畫出飲水機的出水口：

.fridge::before {
    background: 
        radial-gradient(
            circle at 50% 22%,
            black, black 1em,
            transparent 1em
        ),
        linear-gradient(
            transparent 25%,
            #222 25%
        ) no-repeat center top / 94% 98%,
        black;
}

再用徑向漸變畫出 4 個 led 燈：

.fridge::before {
    background: 
        radial-gradient(
            circle at 88% 10%,
            limegreen, limegreen 0.2em,
            transparent 0.2em
        ),
        radial-gradient(
            circle at 75% 10%,
            hotpink, hotpink 0.2em,
            transparent 0.2em
        ),
        radial-gradient(
            circle at 25% 10%,
            dodgerblue, dodgerblue 0.2em,
            transparent 0.2em
        ),
        radial-gradient(
            circle at 12% 10%,
            gold, gold 0.2em,
            transparent 0.2em
        ),
        radial-gradient(
            circle at 50% 22%,
            black, black 1em,
            transparent 1em
        ),
        linear-gradient(
            transparent 25%,
            #222 25%
        ) no-repeat center top / 94% 98%,
        black;
}

用 after 僞元素畫出杯子的輪廓：

.fridge::after {
    content: '';
    position: absolute;
    width: 2em;
    height: 3em;
    background: deepskyblue;
    bottom: calc((100% - 7.5em) / 2);
    left: calc(2.5em + (6em - 2em) / 2);
}

稍稍修整杯子的形狀，使其頂大底小：

.fridge::after {
    clip-path: polygon(0 0, 100% 0, 90% 100%, 10% 100%);
}

讓杯子頂部的顏色變淺，看起來好像杯裏有水的樣子：

.fridge::after {
    background:
        linear-gradient(
            to bottom,
            lightskyblue 25%,
            transparent 25%
        ),
        deepskyblue;
}

最後，給水裏加些氣泡：

.fridge::after {
    background:
        radial-gradient(
            circle at 35% 40%,
            lightblue, lightblue 0.1em,
            transparent 0.4em
        ),
        radial-gradient(
            circle at 65% 60%,
            lightblue, lightblue 0.1em,
            transparent 0.3em
        ),
        radial-gradient(
            circle at 45% 80%,
            lightblue, lightblue 0.1em,
            transparent 0.2em
        ),
        linear-gradient(
            to bottom,
            lightskyblue 25%,
            transparent 25%
        ),
        deepskyblue;
}

大功告成！