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JavaScript仿小米輪播圖效果

 更新時(shí)間：2021年10月18日 09:51:31   作者：小幸運(yùn)  
這篇文章主要為大家詳細(xì)介紹了JavaScript仿小米輪播圖效果，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文是自己仿寫的小米輪播圖的寫法，通過透明度改變進(jìn)行輪播的，新手，寫的可能不是很好，有啥不合理的情況，望提出，指正，全部的代碼放最下面
有很多寫法重復(fù)，有空的時(shí)候，我把重復(fù)的代碼封裝一下

關(guān)于透明度漸變的動(dòng)畫效果

比如 delayOpacity(OliArray[pre],0,-0.1); 就是將OliArray[pre]這個(gè)對(duì)象的透明度轉(zhuǎn)換成0，速度為0.1

function delayOpacity(obj,target,speed){
        clearInterval(timer);
        timer = setInterval(function(){
            var old = getComputedStyle(obj,null)['opacity']; 
            var newVal = +old + +speed;//+是將字符串轉(zhuǎn)變成number類型
            if(parseInt(speed)>0 && newVal>=target){
                newVal = 1;
            }
            if(parseInt(speed)<0 && newVal<=target){
                newVal = 0;
            }
            obj.style.opacity = newVal;//每次將新的值賦值給該對(duì)象的透明度，產(chǎn)生漸變效果
            if(newVal==target){
                clearInterval(timer);//當(dāng)透明度的值和目標(biāo)中的透明度的值一樣的時(shí)候，將定時(shí)器關(guān)閉
            }
        },100);
    }

關(guān)于自動(dòng)輪播的方法

我的輪播有四張，但是寫了五張圖片，第五張和第一張圖片是一樣的，目的是為了透明度轉(zhuǎn)換的比較合理，不會(huì)突然從最后一張變到第一張
全局變量 next代表輪播圖將要切換的那一張，pre代表輪播圖目前的這張

function autoPlay(){
        autoTimer = setInterval(function(){
            next++;
            pre++;
            next %= OliArray.length;
            pre %= OliArray.length;
            if(pre==OliArray.length-1){
                pre = 0;
            }
            for(let i=0;i<OliArray.length;i++){
                if(i!=next){
                    OliArray[i].style.zIndex = 0;
                    /*解決點(diǎn)擊前幾張圖片時(shí)，之后自動(dòng)輪播沒有切換效果的問題，
                    由于后面的圖片顯示的效果在前面的圖片之上,所以如果在播放到第三張圖片時(shí)，
                    點(diǎn)擊第一張圖片后，自動(dòng)輪播時(shí)，因?yàn)榈谌龔垐D片的顯示在第二張圖片之上
                    所以從第一張到第二張，是沒有動(dòng)畫效果，且圖片一直停在第三張
                    所以要把將要顯示的圖片的層級(jí)設(shè)置為1，其他圖片的層級(jí)設(shè)置為0*/
                }
                if(i!=pre)
                    OliArray[i].style.opacity = 0;
                if(i!=OliArray.length-1){
                    PointerArray[i].className = ""; //這個(gè)是點(diǎn)擊時(shí)，除點(diǎn)擊的那個(gè)原點(diǎn)外，其他的激活的樣式清空
                }
            }
            OliArray[next].style.zIndex=1;
            delayOpacity(OliArray[pre],0,-0.1);//將上一張的透明度由1變成0
            delayOpacity(OliArray[next],1,0.1);//將要顯示的圖片的透明度由0變成1
            if(next==OliArray.length-1) {
                next = 0;
                OliArray[next].style.opacity = 1;//到最后一張圖片的時(shí)候，立即切換到第一張，相對(duì)于假裝輪播到第一張了，因?yàn)橛脩舻难劬]有那么亮
            }
            PointerArray[next].className = "active";
        },3000);
    }

關(guān)于點(diǎn)擊上一張圖片

prevBanner.onclick = function(){
        //將自動(dòng)輪播的定時(shí)器清空
        clearInterval(autoTimer);
        pre = next;//此時(shí)的pre就是原來切換到的那張圖片 
        next = next-1>=0? next-1:OliArray.length-2;//next就是上一張,要切換的圖片
        for(let i=0;i<OliArray.length;i++){
            if(i!=next){
                OliArray[i].style.zIndex = 0;
            }
            if(i!=pre)
                OliArray[i].style.opacity = 0;
            if(i!=OliArray.length-1){
                PointerArray[i].className = "";
            }
        }
        OliArray[next].style.zIndex = 1;
        delayOpacity(OliArray[pre],0,-0.1);
        delayOpacity(OliArray[next],1,0.1);
        if(next==OliArray.length-1) {
            next = 0;
            OliArray[next].style.opacity = 1;
        }
        PointerArray[next].className = "active";
        pre = next - 1;
        //開啟自動(dòng)輪播
        autoPlay();
    }

關(guān)于點(diǎn)擊下一張

和自動(dòng)輪播有點(diǎn)像，但是沒有定時(shí)器（這里我覺得可以封裝函數(shù)來寫，以后改一下）

nextBanner.onclick = function(){
        //將自動(dòng)輪播的定時(shí)器清空
        clearInterval(autoTimer);
        next++;
        pre++;
        next %= OliArray.length;
        pre %= OliArray.length;
        if(pre==OliArray.length-1){
            pre = 0;
        }
        for(let i=0;i<OliArray.length;i++){
            if(i!=next){
                OliArray[i].style.zIndex = 0;
            }
            if(i!=pre)
                OliArray[i].style.opacity = 0;
            if(i!=OliArray.length-1){
                PointerArray[i].className = "";
            }
        }
        OliArray[next].style.zIndex = 1;
        delayOpacity(OliArray[pre],0,-0.1);
        delayOpacity(OliArray[next],1,0.1);
        if(next==OliArray.length-1) {
            next = 0;
            OliArray[next].style.opacity = 1;
        }
        PointerArray[next].className = "active";
        //開啟自動(dòng)輪播
        autoPlay();
    }

關(guān)于點(diǎn)擊某個(gè)原點(diǎn)，切換到該原點(diǎn)的圖片

for(let i=0;i<PointerArray.length;i++){
        PointerArray[i].onclick = function(){
            //將自動(dòng)輪播的定時(shí)器清空
            clearInterval(autoTimer);
            for(let j=0;j<OliArray.length;j++){
                if(j!=i){
                    OliArray[j].style.zIndex = 0;
                }
                if(j!=next)
                    OliArray[j].style.opacity = 0;
                if(j!=OliArray.length-1){
                    PointerArray[j].className = "";
                }
            }
            OliArray[i].style.zIndex=1;
            delayOpacity(OliArray[next],0,-0.1);
            delayOpacity(OliArray[i],1,0.1);
            PointerArray[i].className = "active";
            pre = i - 1 == 0? OliArray.length-1:i-1;
            next = i;
            //開啟自動(dòng)輪播
            autoPlay();
        }
    }

html部分

<div class="banner-wapper">
        <div class="container">
            <div class="banner">
                <ul class="img-list">
                    <li>
                        <a href="#">
                            <img src="./img/1.jpg" alt="">
                        </a>
                    </li>
                    <li>
                        <a href="#">
                            <img src="./img/2.jpg" alt="">
                        </a>
                    </li>
                    <li>
                        <a href="#">
                            <img src="./img/3.jpg" alt="">
                        </a>
                    </li>
                    <li>
                        <a href="#">
                            <img src="./img/4.jpg" alt="">
                        </a>
                    </li>
                    <li>
                        <a href="#">
                            <img src="./img/1.jpg" alt="">
                        </a>
                    </li>
                </ul>
                <div class="pointer">
                    <a href="javascript:;"></a>
                    <a href="javascript:;"></a>
                    <a href="javascript:;"></a>
                    <a href="javascript:;"></a>
                </div>
                <div class="prev-next">
                    <a class="prev" href="javascript:;"></a>
                    <a class="next" href="javascript:;"></a>
                </div>
            </div>
        </div>
</div>

CSS部分

.banner{
    position: relative;
    height: 460px;
}
.banner .img-list li{
    position: absolute;
    opacity: 0;
}
.banner-wapper .banner a img{
    width: 1226px;
    height: 460px;
    vertical-align: top;
}
.banner .img-list li:nth-child(1){
    opacity: 1;
}
.pointer{
    z-index: 2;
    position: absolute;
    right: 30px;
    bottom: 20px;
}
.pointer a{
    float: left;
    width: 6px;
    height: 6px;
    border: 2px rgba(255, 255, 255, 0.4) solid;
    box-sizing: content-box;
    margin: 0 4px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.4);
}
.pointer a:hover,
.pointer .active{
    border-color:rgba(0, 0, 0, 0.4);
    background-color: rgba(255, 255, 255, 0.4);
}
.prev-next a{
    width: 41px;
    height: 69px;
    position: absolute;
    top: 0;
    bottom: 0;
    margin: auto 0;
    background-image: url(../img/icon-slides.png);
}
.prev-next .prev{
    z-index: 2;
    left: 234px;
    background-position: -84px 50%;
}
.prev-next .prev:hover{
    background-position: 0 0;
}
.prev-next .next{
    z-index: 2;
    right: 0;
    background-position: -125px 50%;
}
.prev-next .next:hover{
    background-position: -42px 50%;
}

js部分

window.onload = function(){
    var Oul = document.getElementsByClassName("img-list")[0];
    var OliArray = Oul.getElementsByTagName("li");
    var pointer = document.getElementsByClassName("pointer")[0];
    var PointerArray = pointer.getElementsByTagName("a");
    var nextBanner = document.getElementsByClassName("next")[0];
    var prevBanner = document.getElementsByClassName("prev")[0];

    var timer,autoTimer, next = 0,pre = OliArray.length-1;
    PointerArray[0].className = "active";
    
    autoPlay();
    // 點(diǎn)擊輪播
    for(let i=0;i<PointerArray.length;i++){
        PointerArray[i].onclick = function(){
            //將自動(dòng)輪播的定時(shí)器清空
            clearInterval(autoTimer);
            for(let j=0;j<OliArray.length;j++){
                if(j!=i){
                    OliArray[j].style.zIndex = 0;
                }
                if(j!=next)
                    OliArray[j].style.opacity = 0;
                if(j!=OliArray.length-1){
                    PointerArray[j].className = "";
                }
            }
            // console.log(pre,next,i)
            OliArray[i].style.zIndex=1;
            delayOpacity(OliArray[next],0,-0.1);
            delayOpacity(OliArray[i],1,0.1);
            PointerArray[i].className = "active";
            pre = i - 1 == 0? OliArray.length-1:i-1;
            next = i;
            //開啟自動(dòng)輪播
            autoPlay();
        }
    }

    // 點(diǎn)擊下一張
    nextBanner.onclick = function(){
        //將自動(dòng)輪播的定時(shí)器清空
        clearInterval(autoTimer);
        next++;
        pre++;
        next %= OliArray.length;
        pre %= OliArray.length;
        if(pre==OliArray.length-1){
            pre = 0;
        }
        for(let i=0;i<OliArray.length;i++){
            if(i!=next){
                OliArray[i].style.zIndex = 0;
            }
            if(i!=pre)
                OliArray[i].style.opacity = 0;
            if(i!=OliArray.length-1){
                PointerArray[i].className = "";
            }
        }
        OliArray[next].style.zIndex = 1;
        delayOpacity(OliArray[pre],0,-0.1);
        delayOpacity(OliArray[next],1,0.1);
        if(next==OliArray.length-1) {
            next = 0;
            OliArray[next].style.opacity = 1;
        }
        PointerArray[next].className = "active";
        //開啟自動(dòng)輪播
        autoPlay();
    }
    //點(diǎn)擊上一張
    prevBanner.onclick = function(){
        //將自動(dòng)輪播的定時(shí)器清空
        clearInterval(autoTimer);
        pre = next;
        next = next-1>=0? next-1:OliArray.length-2;
        for(let i=0;i<OliArray.length;i++){
            if(i!=next){
                OliArray[i].style.zIndex = 0;
            }
            if(i!=pre)
                OliArray[i].style.opacity = 0;
            if(i!=OliArray.length-1){
                PointerArray[i].className = "";
            }
        }
        OliArray[next].style.zIndex = 1;
        delayOpacity(OliArray[pre],0,-0.1);
        delayOpacity(OliArray[next],1,0.1);
        if(next==OliArray.length-1) {
            next = 0;
            OliArray[next].style.opacity = 1;
        }
        PointerArray[next].className = "active";
        pre = next - 1;
        //開啟自動(dòng)輪播
        autoPlay();
    }

    // 自動(dòng)輪播
    function autoPlay(){
        autoTimer = setInterval(function(){
            next++;
            pre++;
            next %= OliArray.length;
            pre %= OliArray.length;
            if(pre==OliArray.length-1){
                pre = 0;
            }
            for(let i=0;i<OliArray.length;i++){
                if(i!=next){
                    OliArray[i].style.zIndex = 0;
                }
                if(i!=pre)
                    OliArray[i].style.opacity = 0;
                if(i!=OliArray.length-1){
                    PointerArray[i].className = "";
                }
            }
            OliArray[next].style.zIndex=1;
            delayOpacity(OliArray[pre],0,-0.1);
            delayOpacity(OliArray[next],1,0.1);
            if(next==OliArray.length-1) {
                next = 0;
                OliArray[next].style.opacity = 1;
            }
            PointerArray[next].className = "active";
        },3000);
    }
    function delayOpacity(obj,target,speed){
        clearInterval(timer);
        timer = setInterval(function(){
            var old = getComputedStyle(obj,null)['opacity'];
            // console.log(getComputedStyle(obj,null)['opacity'])
            var newVal = +old + +speed;
            // console.log(obj,newVal)
            if(parseInt(speed)>0 && newVal>=target){
                newVal = 1;
            }
            if(parseInt(speed)<0 && newVal<=target){
                newVal = 0;
            }
            obj.style.opacity = newVal;
            // console.log(getComputedStyle(obj,null)['opacity'])
            if(newVal==target){
                clearInterval(timer);
            }
        },100);
    }
}

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