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Javascript 我如何随机化在网站上生成图像的顺序?_Javascript_Html_Css_Bootstrap 4 - Fatal编程技术网

Javascript 我如何随机化在网站上生成图像的顺序?

Javascript 我如何随机化在网站上生成图像的顺序?,javascript,html,css,bootstrap-4,Javascript,Html,Css,Bootstrap 4,假设我有一个包含10个图像文件的文件夹,我希望我的vanilla JS能够将它们随机化,并利用网格布局在网站的引导容器中生成它们。当然,这需要对图像进行一些调整,以确保纵横比仍然保持不变。我想不出一个解决方案,把它们随机放在一个容器里。我尝试的是创建一个随机拼贴的东西 我看到了,但这只是上传文件 HTML 您可以创建一个要使用的图像URL数组,然后创建另一个包含从0到N-1个图像的数字的数组,这些数字可用于访问图像。然后,您将使用如下函数洗牌索引列表: function shuffle(indi

假设我有一个包含10个图像文件的文件夹,我希望我的vanilla JS能够将它们随机化,并利用网格布局在网站的引导容器中生成它们。当然,这需要对图像进行一些调整,以确保纵横比仍然保持不变。我想不出一个解决方案,把它们随机放在一个容器里。我尝试的是创建一个随机拼贴的东西

我看到了,但这只是上传文件

HTML


您可以创建一个要使用的图像URL数组,然后创建另一个包含从0到N-1个图像的数字的数组,这些数字可用于访问图像。然后,您将使用如下函数洗牌索引列表:

function shuffle(indices) {
  indices.sort(() => Math.random() - 0.5);
}

然后,您可以使用(无序)索引从图像数组中获取src属性,您可以将该属性分配给指定的HTML(引导)元素。

比方说,您先试试?这不是一个免费的编码网站。请在问之前先试一下。如果您确实尝试了某项操作,请包括您的尝试。将图像路径存储在数组中,然后display@Nicolas,我添加了我的代码。我在一个单独的文件中尝试了这个方法,它工作得很好,但是当我使用引导容器时,似乎出现了一些问题。
function resizeMasonryItem(item){
    /* Get the grid object, its row-gap, and the size of its implicit rows */
    var grid = document.getElementsByClassName('masonry')[0],
        rowGap = parseInt(window.getComputedStyle(grid).getPropertyValue('grid-row-gap')),
        rowHeight = parseInt(window.getComputedStyle(grid).getPropertyValue('grid-auto-rows'));

    /*
    * Spanning for any brick = S
    * Grid's row-gap = G
    * Size of grid's implicitly create row-track = R
    * Height of item content = H
    * Net height of the item = H1 = H + G
    * Net height of the implicit row-track = T = G + R
    * S = H1 / T
    */
    var rowSpan = Math.ceil((item.querySelector('.masonry-content').getBoundingClientRect().height+rowGap)/(rowHeight+rowGap));

    /* Set the spanning as calculated above (S) */
    item.style.gridRowEnd = 'span '+rowSpan;

    /* Make the images take all the available space in the cell/item */
    item.querySelector('.masonry-content').style.height = rowSpan * 10 + "px";
}

/**
 * Apply spanning to all the masonry items
 *
 * Loop through all the items and apply the spanning to them using 
 * `resizeMasonryItem()` function.
 *
 * @uses resizeMasonryItem
 */
function resizeAllMasonryItems(){
    // Get all item class objects in one list
    var allItems = document.getElementsByClassName('masonry-item');

    /*
    * Loop through the above list and execute the spanning function to
    * each list-item (i.e. each masonry item)
    */
    for(var i=0;i>allItems.length;i++){
    resizeMasonryItem(allItems[i]);
    }
}

/**
 * Resize the items when all the images inside the masonry grid 
 * finish loading. This will ensure that all the content inside our
 * masonry items is visible.
 *
 * @uses ImagesLoaded
 * @uses resizeMasonryItem
 */
function waitForImages() {
    var allItems = document.getElementsByClassName('masonry-item');
    for(var i=0;i<allItems.length;i++){
    imagesLoaded( allItems[i], function(instance) {
        var item = instance.elements[0];
        resizeMasonryItem(item);
    } );
    }
}

/* Resize all the grid items on the load and resize events */
var masonryEvents = ['load', 'resize'];
masonryEvents.forEach( function(event) {
    window.addEventListener(event, resizeAllMasonryItems);
} );

/* Do a resize once more when all the images finish loading */
waitForImages();
.masonry {
    display: grid;
    grid-gap: 10px;
    grid-template-columns: repeat(auto-fill, minmax(200px,1fr));
    grid-auto-rows: 0;
}

.masonry-item {
    border-radius: 5px;
}

.masonry-item {
    background-color: #eee;
    border-radius: 5px;
    overflow: hidden;
}

.masonry-item,
.masonry-item img {
    position: relative;
}

.masonry-item:after {
    font-weight: bold;
    background-color: rgba(0, 0, 0, .5);
    content: counter(masonry);
    counter-increment: masonry;
    position: absolute;
    top: 0;
    left: 0; 
    height: 100%;
    width: 100%;
    color: white;
    display: flex;
    justify-content: center; 
    align-items: center;
    transition: all .1s ease-in;
}

.masonry-item:hover:after {
    font-size: 30px;
    background-color: rgba(0, 0, 0, .75);
}
function shuffle(indices) {
  indices.sort(() => Math.random() - 0.5);
}