javascript - 带有随机图片的幻灯片

Question

所以我用 HTML/CSS/JS 制作了这个小幻灯片，我想让 6 张图片随机出现，而不是 1,2,3.. 更像是 2,3,1.. 例如。任何帮助表示赞赏。非常感谢。

JS:

var imagecount = 1;
var total = 6;

function slide(x) {
    var Image = document.getElementById('img');
    imagecount = imagecount + x;
    if(imagecount > total){imagecount = 1;}
    if(imagecount < 1){imagecount = total;}
    Image.src = "images/img"+ imagecount +".jpg";
    ChangeText(imagecount);
}

window.setInterval(function slideA(x) {
    var Image = document.getElementById('img');
    imagecount = imagecount + 1;
    if(imagecount > total){imagecount = 1;}
    if(imagecount < 1){imagecount = total;}
    Image.src = "images/img"+ imagecount +".jpg";
    ChangeText(imagecount);
}, 3000);

function ChangeText(imgNum){
    var allImagesAndText = {1: "Seltene römische Goldmünze", 2: "Römische Funde", 3: "Römische Wandmalerei", 4: "Tutanchamun", 5: "Cheops Pyramide", 6: "Ägyptische Malerei"};
    document.getElementById("text1").innerHTML = allImagesAndText[imgNum];
}

CSS:

#container {
  height: 450px;
  width: 650px;
  margin: 20px auto;
  position: relative;
  z-index: 1;
  border: 10px solid #000;
  border-radius: 10px;
}
#img {
  height: 450px;
  width: 650px;
}
#left_holder {
  height: 450px;
  width: 100px;
  position: absolute;
  left: 0px;
  top: 0px;
}
#right_holder {
  height: 450px;
  width: 100px;
  position: absolute;
  right: 0px;
  top: 0px;
}
.left {
  height: 50px;
  width: 50px;
  position: absolute;
  top: 40%;
  left: 0px;
}
.right {
  height: 50px;
  width: 50px;
  position: absolute;
  top: 40%;
  right: 0px;
}
#text1 {
  position: absolute;
  color: #fff;
  font-size: 32px;
  background-color: #000;
  opacity: 0.5;
  left: 37%;
  z-index: 2;
}

HTML:

<div id="container">
  <div id="text1">Text</div>
  <img src="images/img1.jpg" id="img" />
  <div id="left_holder">
    <img onClick="slide(-1)" class="left" src="images/arrow_left.png" />
  </div>
  <div id="right_holder">
    <img onClick="slide(1)" class="right" src="images/arrow_right.png" />
  </div>
</div>

Answer 1

您可以创建独特的随机图像 slider 。所以它不会多次重复图像(Soham 的回答很好，但它会连续多次重复相同的图像)。

像这样:

var imagecount = 1;
var total = 6;
var uniqueRandoms = [];

function makeUniqueRandom() {
    if (!uniqueRandoms.length) {
        for (var i = imagecount; i <= total; i++) {
            uniqueRandoms.push(i);
        }
    }
    var index = Math.floor(Math.random() * uniqueRandoms.length);
    var val = uniqueRandoms[index];

    uniqueRandoms.splice(index, 1);

    return val;
}

我用了this所以回答。

然后在您的代码中，只需在您需要的地方调用该函数即可。

您的自动滑动代码示例在这里 https://jsfiddle.net/2gra4wk1/