Animation effects of native js carousel renderings (with code)

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Native JS-Carousel
Today I will write a carousel JS effect written in native JS.
Implementation principle:
1. Create an array and write the corresponding z-index, opacity, top, width for each picture;
2. The operation to realize rotation is to construct The first set of values ​​in the array is placed in the last set, and it will be executed once when the button is clicked.
Display renderings:

html layout:

<p class="wrap" id="wrap">
    <p class="slide" id="slide">
        <ul>
            <li><a href=""><img src="/static/imghwm/default1.png"  data-src="images/logo.png"  class="lazy"      style="max-width:90%"  style="max-width:90%" alt=""></a></li>
            <li><a href=""><img src="/static/imghwm/default1.png"  data-src="images/slide.jpg"  class="lazy"      style="max-width:90%"  style="max-width:90%" alt=""></a></li>
            <li><a href=""><img src="/static/imghwm/default1.png"  data-src="images/slide2.jpg"  class="lazy"      style="max-width:90%"  style="max-width:90%" alt=""></a></li>
            <li><a href=""><img src="/static/imghwm/default1.png"  data-src="images/i1.jpg"  class="lazy"      style="max-width:90%"  style="max-width:90%" alt=""></a></li>
            <li><a href=""><img src="/static/imghwm/default1.png"  data-src="images/sto.jpg"  class="lazy"      style="max-width:90%"  style="max-width:90%" alt=""></a></li>
        </ul>
        <p class="arrow" id="arrow">
            <a href="javascript:;" id="arrLeft" class="prev"></a>
            <a href="javascript:;" id="arrRight" class="next"></a>
        </p>
    </p></p>

css style:

* {            margin: 0;            padding: 0;        }

        ul {            list-style: none;        }

        .wrap {            width: 1200px;            margin: 100px auto;        }

        .slide {            height: 500px;            position: relative;            width: 1200px;        }

        .slide ul li {            position: absolute;            top: 0;            left: 0;            z-index: 1;        }

        .slide li img {            width: 100%;        }

        .arrow {            position: absolute;            width: 100%;            top: 50%;            opacity: 0;            z-index: 3;        }

        .prev,        .next {            position: absolute;            height: 110px;            width: 110px;            border-radius: 50%;            top: 50%;            //margin-top: -56px;            overflow: hidden;            text-decoration: none;        }
        .prev{            left: 0;            background: url("images/slider-icons.png") no-repeat left top;        }
        .next{            right: 0;            background: url("images/slider-icons.png") no-repeat right top;        }

JS part:
Next, we first store the style of the corresponding image in an array.

//写每张图片对应的样式
    var config = [
        {            "width": 400,            "top": 20,            "left": 50,            "opacity": 0.2,            "zIndex": 2
        },      //0
        {            "width": 600,            "top": 70,            "left": 0,            "opacity": 0.8,            "zIndex": 3
        },     //1
        {            "width": 800,            "top": 100,            "left": 200,            "opacity": 1,            "zIndex": 4
        },     //2
        {            "width": 600,            "top": 70,            "left": 600,            "opacity": 0.8,            "zIndex": 3
        },    //3
        {            "width": 400,            "top": 20,            "left": 750,            "opacity": 0.2,            "zIndex": 2
        }    //4
    ];

When the page is loaded, the pictures are scattered, that is, the array just created is called, and they are assigned to each picture one by one.

var list=my$("slide").getElementsByTagName("li"); //拿到所有li
        function assign() {    //分配函数
            for (var i=0;i<list.length;i++){
                animate(list[i],config[i],function () {
                    flag=true;
                });
            }
        }
        assign();

There will be left and right arrows when the mouse enters and leaves. Show and hide, the principle of clicking the button rotation is to change the first of the array to the last or the last group to the first. The flag is to control when the button is clicked to ensure that a set of animations is completed before the next rotation animation can continue.

//鼠标进入，左右焦点的p显示
        my$("wrap").onmouseover=function () {
            animate(my$("arrow"),{"opacity":1});
        };        //鼠标离开，左右焦点的p隐藏
        my$("wrap").onmouseout=function () {
            animate(my$("arrow"),{"opacity":0});
        };        //点击右边按钮事件
        my$("arrRight").onclick=function () {
            if (flag){
                flag=false;
                config.push(config.shift());     //把第一组值放到最后一组

                assign();
            }

        };        //点击左边按钮事件
        my$("arrLeft").onclick=function () {
            if (flag){
                flag=false;
                config.unshift(config.pop());   //把最后一组值放到第一组
                assign();
            }
        };
    };

Complete JS code:

<script>
    //变速动画函数
    function animate(element, json, fn) {
        clearInterval(element.timeId);   //清理定时器
        element.timeId = setInterval(function () {
            var flag = true;    //假设默认为当前值已经等于目标值
            for (var arrt in json) {                if (arrt == "opacity") {   //如果属性值为opacity
                    var current = getStyle(element, arrt) * 100;   //current和target先扩大100倍
                    target = json[arrt] * 100;                    var step = (target - current) / 10;
                    step = step > 0 ? Math.ceil(step) : Math.floor(step);
                    current += step;
                    element.style[arrt] = current / 100;   //运算完后缩小100倍
                } else if (arrt == "zIndex") {   //如果属性值为zindex
                    element.style[arrt] = json[arrt];
                } else {      //普通属性
                    var current = parseInt(getStyle(element, arrt));
                    target = json[arrt];                    var step = (target - current) / 10;
                    step = step > 0 ? Math.ceil(step) : Math.floor(step); //step大于零向上取整，小于零向下取整
                    current += step;
                    element.style[arrt] = current + "px";
                }                if (current != target) {
                    flag = false;
                }
            }            if (flag) {    //只有所有属性的当前值已经等于目标值，才清理定时器
                clearInterval(element.timeId);                if (fn) {     //回调函数
                    fn();
                }
            }
            console.log("当前位置：" + current + "目标位置：" + target + " 移动步数：" + step);   //测试函数
        }, 20);
    }    function getStyle(element, arrt) {
        return window.getComputedStyle ? window.getComputedStyle(element, null)[arrt] : element.currentStyle[arrt];

    }    function my$(id) {
        return document.getElementById(id);
    }    //写每张图片对应的样式
    var config = [
        {            &quot;width&quot;: 400,            &quot;top&quot;: 20,            &quot;left&quot;: 50,            &quot;opacity&quot;: 0.2,            &quot;zIndex&quot;: 2
        },      //0
        {            &quot;width&quot;: 600,            &quot;top&quot;: 70,            &quot;left&quot;: 0,            &quot;opacity&quot;: 0.8,            &quot;zIndex&quot;: 3
        },     //1
        {            &quot;width&quot;: 800,            &quot;top&quot;: 100,            &quot;left&quot;: 200,            &quot;opacity&quot;: 1,            &quot;zIndex&quot;: 4
        },     //2
        {            &quot;width&quot;: 600,            &quot;top&quot;: 70,            &quot;left&quot;: 600,            &quot;opacity&quot;: 0.8,            &quot;zIndex&quot;: 3
        },    //3
        {            &quot;width&quot;: 400,            &quot;top&quot;: 20,            &quot;left&quot;: 750,            &quot;opacity&quot;: 0.2,            &quot;zIndex&quot;: 2
        }    //4
    ];    var flag=true;     //假设动画全部执行完毕-----锁

    //页面加载的事件
    window.onload=function () {
        //1---散开图片
        var list=my$(&quot;slide&quot;).getElementsByTagName(&quot;li&quot;); //拿到所有li
        function assign() {    //分配函数
            for (var i=0;i&lt;list.length;i++){
                animate(list[i],config[i],function () {
                    flag=true;
                });
            }
        }
        assign();        //鼠标进入，左右焦点的p显示
        my$(&quot;wrap&quot;).onmouseover=function () {
            animate(my$(&quot;arrow&quot;),{&quot;opacity&quot;:1});
        };        //鼠标离开，左右焦点的p隐藏
        my$(&quot;wrap&quot;).onmouseout=function () {
            animate(my$(&quot;arrow&quot;),{&quot;opacity&quot;:0});
        };        //点击右边按钮事件
        my$(&quot;arrRight&quot;).onclick=function () {
            if (flag){
                flag=false;
                config.push(config.shift());     //把第一组值放到最后一组

                assign();
            }

        };        //点击左边按钮事件
        my$(&quot;arrLeft&quot;).onclick=function () {
            if (flag){
                flag=false;
                config.unshift(config.pop());   //把最后一组值放到第一组
                assign();
            }
        };
    };</script>

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