Javascript 网站页面加载图像需要一段时间_Javascript_Jquery_Html_Css

Javascript 网站页面加载图像需要一段时间

javascript jquery html css

Javascript 网站页面加载图像需要一段时间,javascript,jquery,html,css,Javascript,Jquery,Html,Css,所以我在我的网站上有一个页面，上面有一个图像滑块，但是我加载的图像分辨率是4032x3024，这需要一段时间。它们是JPEG图像。我仍然想显示图像的完整分辨率。有没有一种方法我可以先加载一个低分辨率的版本，然后当好的图像完全加载时，我就交换它们这是我的密码： <?php //Set total images for each albums $imagesTotalPC = 10; ?> <html> <head> <meta

所以我在我的网站上有一个页面，上面有一个图像滑块，但是我加载的图像分辨率是4032x3024，这需要一段时间。它们是JPEG图像。我仍然想显示图像的完整分辨率。有没有一种方法我可以先加载一个低分辨率的版本，然后当好的图像完全加载时，我就交换它们

这是我的密码：

<?php
    //Set total images for each albums
    $imagesTotalPC = 10;
?>

<html>

<head>
    <meta charset="utf-8">
    <title>Louka Papineau - Site Personnel</title>
    <link type="text/css" rel="stylesheet" href="../css/styles.css">
</head>

<body>
    <div id="particles-js"></div>
    <script type="text/javascript" src="../js/particles.js"></script>
    <script type="text/javascript" src="../js/app.js"></script>
    <script type="text/javascript" src="../js/jquery.js"></script>

    <div class="outer-container">
        <br>
        <ul>
            <li><a href="../default.html">Acceuil</a></li>
            <li><a href="../personnelle.html">Information sur ta personne</a></li>
            <li><a href="../talents.html">Talents</a></li>
            <li class="dropdown">
                <a href="javascript:void(0)" class="dropbtn">Intérêts</a>
                <div class="dropdown-content">
                    <a href="../interets/sports.html">Sportifs</a>
                    <a href="../interets/professionnels.html">Avenir Professionnels</a>
                    <a href="../interets/passe_temps.html">Passe-Temps</a>
                    <a href="../interets/voyage.html">Voyages</a>
                </div>
            </li>
            <li><a href="../photos.html" class="activeNav">Album photos</a></li>
            <li><a href="but.php">But du site web</a></li>
            <li><a href="https://www.forums.loukapapineau.ca/mybb" target="_blank">Forum</a></li>
            <li><a href="contact.php">Contact</a></li>
        </ul>

        <div class="your-content" style="padding: 5px 10px;">
            <div class="galleryContainer">
                <div class="galleryThumbnailsContainer">
                    <div class="galleryThumbnails">
                        <?php
                            for ($t = 1; $t <= $imagesTotalPC; $t++) {
                               echo '<a href="javascript: changeimage(' . $t . ')" class="thumbnailsimage' . $t . '"><img src="../images/thumbPC/image' . $t . '.jpg" width="auto" height="100" alt="" /></a>';
                        }
                         ?>
                    </div>
                </div>

                <div class="galleryPreviewContainer">
                    <div class="galleryPreviewImage">
                        <?php
                            for ($i = 1; $i <= $imagesTotalPC; $i++) {
                               echo '<img class="previewImage' . $i . '" src="../images/thumbPC/image' . $i . '.jpg" width="900" height="auto" alt="" />';
                        }
                         ?>
                    </div>

                    <div class="galleryPreviewArrows">
                        <a href="#" class="previousSlideArrow">&lt;</a>
                        <a href="#" class="nextSlideArrow">&gt;</a>
                    </div>
                </div>

                <div class="galleryNavigationBullets">
                    <?php
                         for ($b = 1; $b <= $imagesTotalPC; $b++) {
                            echo '<a href="javascript: changeimage(' . $b . ')" class="galleryBullet' . $b . '"><span>Bullet</span></a> ';
                         }
                      ?>
                </div>
            </div>
        </div>
    </div>



    <script type="text/javascript">
        // init variables
        var imagesTotal = <?php echo $imagesTotalPC; ?>;
        var currentImage = 1;
        var thumbsTotalWidth = 0;

        $('a.galleryBullet' + currentImage).addClass("active");
        $('a.thumbnailsimage' + currentImage).addClass("active");


        // SET WIDTH for THUMBNAILS CONTAINER
        $(window).load(function() {
            $('.galleryThumbnails a img').each(function() {
                thumbsTotalWidth += $(this).width() + 10 + 8 + 4;
            });
            $('.galleryThumbnails').width(thumbsTotalWidth);
        });


        // PREVIOUS ARROW CODE
        $('a.previousSlideArrow').click(function() {
            $('img.previewImage' + currentImage).hide();
            $('a.galleryBullet' + currentImage).removeClass("active");
            $('a.thumbnailsimage' + currentImage).removeClass("active");

            currentImage--;

            if (currentImage == 0) {
                currentImage = imagesTotal;
            }

            $('img.previewImage' + currentImage).show();
            $('a.galleryBullet' + currentImage).addClass("active");
            $('a.thumbnailsimage' + currentImage).addClass("active");

            return false;
        });
        // ===================

        // NEXT ARROW CODE
        $('a.nextSlideArrow').click(function() {
            $('img.previewImage' + currentImage).hide();
            $('a.galleryBullet' + currentImage).removeClass("active");
            $('a.thumbnailsimage' + currentImage).removeClass("active");

            currentImage++;

            if     (currentImage == imagesTotal + 1) {
                currentImage = 1;
            }

            $('a.galleryBullet' + currentImage).addClass("active");
            $('a.thumbnailsimage' + currentImage).addClass("active");
            $('img.previewImage' + currentImage).show();

            return false;
        });
        // ===================


        // BULLETS CODE
        function changeimage(imageNumber) {
            $('img.previewImage' + currentImage).hide();
            currentImage = imageNumber;
            $('img.previewImage' + imageNumber).show();
            $('.galleryNavigationBullets a').removeClass("active");
            $('.galleryThumbnails a').removeClass("active");
            $('a.galleryBullet' + imageNumber).addClass("active");
            $('a.thumbnailsimage' + currentImage).addClass("active");
        }
        // ===================


        // AUTOMATIC CHANGE SLIDES
        function autoChangeSlides() {
            $('img.previewImage' + currentImage).hide();
            $('a.galleryBullet' + currentImage).removeClass("active");
            $('a.thumbnailsimage' + currentImage).removeClass("active");

            currentImage++;

            if (currentImage == imagesTotal + 1) {
                currentImage = 1;
            }

            $('a.galleryBullet' + currentImage).addClass("active");
            $('a.thumbnailsimage' + currentImage).addClass("active");
            $('img.previewImage' + currentImage).show();
        }

    </script>
</body>

</html>

一个好的选择是使用压缩图像。一旦图像被压缩，它可能会占用原来大小的1/3甚至1/4。由于文件较小，浏览器加载它所需的时间较少，这意味着加载时间更快。例如，有这样的网站可以帮助您优化/压缩图像。您可以将5MB图像文件传递到380KB图像文件，而不会丢失太多分辨率。这大大提高了网站的加载速度和时间。您还可以在浏览器中缓存图像。但这对你的项目来说可能有点太复杂了。这是优化加载速度的两种简单方法。谷歌有一个很好的工具，让你检查你的网站的效率。它叫。它可以帮助你看到你可以或需要改善你的网站，并会建议你的解决方案，如果需要的话。我希望这有帮助

研究：

一般来说，加载大尺寸图像对于SEO和网站速度透视来说不是一个好的做法。如果您仍然想加载高分辨率图像，请尝试通过tinypng或任何其他图像优化器优化图像。您必须使用javascript链接加载图像。有很多关于使用javascriptTry逐步编码JPG加载图像的指南

        <div class="galleryContainer">
                <div class="galleryThumbnailsContainer">
                    <div class="galleryThumbnails">
                        <?php
                            for ($t = 1; $t <= $imagesTotalPC; $t++) {
                               echo '<a href="javascript: changeimage(' . $t . ')" class="thumbnailsimage' . $t . '"><img src="../images/thumbPC/image' . $t . '.jpg" width="auto" height="100" alt="" /></a>';
                        }
                         ?>
                    </div>
                </div>

                <div class="galleryPreviewContainer">
                    <div class="galleryPreviewImage">
                        <?php
                            for ($i = 1; $i <= $imagesTotalPC; $i++) {
                               echo '<img class="previewImage' . $i . '" src="../images/thumbPC/image' . $i . '.jpg" width="900" height="auto" alt="" />';
                        }
                         ?>
                    </div>

                    <div class="galleryPreviewArrows">
                        <a href="#" class="previousSlideArrow">&lt;</a>
                        <a href="#" class="nextSlideArrow">&gt;</a>
                    </div>
                </div>

                <div class="galleryNavigationBullets">
                    <?php
                         for ($b = 1; $b <= $imagesTotalPC; $b++) {
                            echo '<a href="javascript: changeimage(' . $b . ')" class="galleryBullet' . $b . '"><span>Bullet</span></a> ';
                         }
                      ?>
                </div>
            </div>
        </div>

a,
.galleryThumbnails img {
    transition: all 150ms linear;
    -webkit-transition: all 150ms linear;
    -moz-transition: all 150ms linear;
}

.galleryContainer {
   margin: 40px auto;
    width: 900px;
}

.galleryPreviewContainer {
    position: relative;
}

.galleryPreviewImage img {
    display: none;
    border-radius: 30px;
    -webkit-border-radius: 30px;
    -moz-border-radius: 30px;
    box-shadow: 5px 5px 0 0 #c1c1c1;
    position: relative;
    top: 0;
    left: 0;
}

img.previewImage1 {
    display: block;
}

.galleryPreviewArrows a {
    font-family: Arial;
    font-size: 30px;
    background: rgba(0, 0, 0, 0.3);
    width: 70px;
    height: 70px;
    line-height: 70px;
    display: block;
    text-align: center;
    color: #FFF;
    text-decoration: none;
    border-radius: 100px;
    -webkit-border-radius: 100px;
    -moz-border-radius: 100px;
    position: absolute;
    left: 20px;
    top: 50%;
    margin-top: -35px;
}

a.nextSlideArrow {
    right: 20px;
    left: auto;
}

.galleryPreviewArrows a:hover {
    background: #000;
    margin-top: -40px;
}

.galleryNavigationBullets {
    text-align: center;
    margin-top: 20px;
    margin-bottom: 60px;
}

.galleryNavigationBullets span {
    display: none;
}

.galleryNavigationBullets a {
    width: 20px;
    height: 20px;
    display: inline-block;
    margin-right: 5px;
    background: #ddd;
}

.galleryNavigationBullets a:hover,
.galleryNavigationBullets a.active {
    background: #555;
}

.galleryThumbnailsContainer {
    width: 900px;
    overflow-x: auto;
    margin-top: 30px;
    margin-bottom: 40px;
    padding: 20px 0;
}

.galleryThumbnails {
    width: 2000px;
}

.galleryThumbnails img {
    border-radius: 20px;
    -webkit-border-radius: 20px;
    -moz-border-radius: 20px;
    margin-right: 10px;
    border: 4px solid #e0e0e0;
    position: relative;
    top: 0;
}

.galleryThumbnails a:hover img {
    top: -5px;
    border: 4px solid #999;
}

.galleryThumbnails a.active img {
    border: 4px solid #0077be;
}

.galleryDescription > div {
    display: none;
}

.galleryDescription > div.visible {
    display: block;
}