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  • 加载图片优化(先用一张小图片做高斯模糊, 再加载大图)

    http://www.jackpu.com/medium-shi-ru-he-zuo-tu-pian-jia-zai-de/

    <!DOCTYPE html>
    <html>
    <head>
        <title></title>
        <style>
            .placeholder {
                background-color: #f6f6f6;
                background-size: cover;
                background-repeat: no-repeat;
                position: relative;
                overflow: hidden;
            }
    
            .placeholder img {
                position: absolute;
                opacity: 0;
                top: 0;
                left: 0;
                width: 100%;
                transition: opacity 1s linear;
            }
    
            .placeholder img.loaded {
                opacity: 1;
            }
    
            .img-small {
                filter: blur(50px);
                /* this is needed so Safari keeps sharp edges */
                transform: scale(1);
            }
        </style>
    </head>
    <body>
    
    <div class="placeholder" data-large="https://cdn-images-1.medium.com/max/1800/1*sg-uLNm73whmdOgKlrQdZA.jpeg">
        <img src="https://cdn-images-1.medium.com/freeze/max/27/1*sg-uLNm73whmdOgKlrQdZA.jpeg?q=20" class="img-small">
        <div style="padding-bottom: 66.6%;"></div>
    </div>
    
    <script>
        window.onload = function() {
    
            var placeholder = document.querySelector('.placeholder'),
                    small = placeholder.querySelector('.img-small')
    
            // 1: load small image and show it
            var img = new Image();
            img.src = small.src;
            img.onload = function () {
                small.classList.add('loaded');
            };
    
            // 2: load large image
            var imgLarge = new Image();
            imgLarge.src = placeholder.dataset.large;
            imgLarge.onload = function () {
                imgLarge.classList.add('loaded');
            };
            placeholder.appendChild(imgLarge);
        }
    </script>
    </body>
    </html>
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  • 原文地址:https://www.cnblogs.com/linux-centos/p/5928418.html
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