css图片设为灰色

使用filter方式将图片设置为灰色

普通图片使用：filter: saturate(0);

纯白图片使用：

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        img {
            width: 100px;
            height: 100px;
        }

        .box1 .img2 {
            filter: saturate(0);
        }

        .box2 .img4 {
            filter: brightness(0.6);
        }
    </style>
</head>

<body>
    <div class="box1">
        <img class="img1" src="./img/图标-放大.svg" alt="">

        <img class="img2" src="./img/图标-放大.svg" alt="">

    </div>

    <!-- 纯白 -->
    <div class="box2">
        <img class="img3" src="./img/图标-缩小.svg" alt="">

        <img class="img4" src="./img/图标-缩小.svg" alt="">

    </div>

</html>