原生js焦点轮播图主要注意这几点：

1、前后按钮实现切换，同时注意辅助图
2、中间的button随着前后按钮对应切换，同时按button也能跳转到相应的index
3、间隔调用与无限轮播。
4、注意在动画时要停止按钮，或者说上一个动画完毕下一个动画才能执行
5、另外在切换图片的时候，底部的Button动画效果，是从底部开始往上升的，要用到transform:scale()和transform-origin:0 100%两个转换属性，代码如下

<!DOCTYPE html>

<html>

<head>

a{text-decoration:none;color:#3DBBF5;}

.wrapper{width:750px;height:350px;background:#001032;margin:20px auto;text-align:center;box-shadow:0 0 12px 2px hsla(0,20%,30%,0.5);padding:10px 15px;position:relative;}

.effect{position:relative;cursor:pointer;}

.effect:hover{color:#02a0e9;}

.effect:before{width:100%;display:inline-block !important;position:absolute;height:1px;background:#02a0e9;transition:all 0.4s ease-in-out;-webkit-transition:all 0.4s ease-in-out;-moz-transition:all 0.4s ease-in-out;transform:scale(0,1);content:'';bottom:-5px;left:0;}

.effect:hover:before{transform:scale(1);-webkit-transform:scale(1);}

#lunBo{margin-top:20px;overflow:hidden;height:300px;width:750px;position:relative;}

#list{position:absolute;z-index:22;height:300px;width:5250px;}

#list img{float:left;}

#buttons { position: absolute; height: 20px; width: 150px; z-index: 99; bottom: 20px; left: 40%;}

span { cursor: pointer; float: left; width: 10px; height: 5px; background: #333; margin-right: 10px;}

.on { background: yellow;transition:all 0.4s ease-in-out;-webkit-transition:all 0.4s ease-in-out;-moz-transition:all 0.4s ease-in-out;transform:scale(1,4);-ms-transform:scale(1,4);-moz-transform:scale(1,4);-webkit-transform:scale(1,4);transform-origin:0% 0%;-webkit-transform-origin:0% 100%;-moz-transform-origin:0% 100%;}

.arrow { cursor: pointer; display: none; line-height: 39px; text-align: center; font-size: 36px; font-weight: bold; width: 40px; height: 100px; line-height:100px;position: absolute; z-index: 92; top: 30%; color: #fff;}

.arrow:hover { background-color: RGBA(0,0,0,.7);}

#lunBo:hover .arrow { display: block;}

#prev { left: 0px;}

#next { right: 0px;}

</style>

</head>

<body>

</div>

</div>

</div>

window.onload = function(){

var lunBo = document.getElementById('lunBo');

var list = document.getElementById('list');

var buttons = document.getElementById('buttons').getElementsByTagName('span');

//console.log(buttons);

var prev = document.getElementById('prev');

var next = document.getElementById('next');

var index = 1;

var animated = false;

var interval = 3000;

var timer;

//显示按钮的索引

function showButton(){

for(var i = 0 ; i < buttons.length ; i++){

if( buttons[i].className == 'on' ){

buttons[i].className = '';

break;

};

buttons[index - 1].className='on';

};

function play(){

timer = setTimeout(function () {

next.onclick();

play();

}, interval);

};

function stop(){

clearTimeout(timer);

};

//向前按钮

next.onclick = function () {

if (animated) {

return;

}

if (index == 5) {

index = 1;

}

else {

index += 1;

}

animate(-750);

showButton();

};

prev.onclick = function () {

if (animated) {

return;

}

if (index == 1) {

index = 5;

}

else {

index -= 1;

}

animate(750);

showButton();

};

//parseInt()转换为纯数值

function animate(offset){

animated = true;

var newLeft = parseInt(list.style.left) + offset; //目标值

var time = 300; //位移总时间为300

var interval = 10; //

var speed = offset/(time/interval); //每次位移量

function go(){

if( (speed < 0 && parseInt(list.style.left) > newLeft) || ( speed > 0 && parseInt(list.style.left) < newLeft) ){

list.style.left = parseInt(list.style.left) + speed + 'px';

setTimeout(go,interval);

}else{

animated = false;

list.style.left = newLeft+ 'px'; //现在的位移

if( newLeft > -750){ //假的辅助图

list.style.left = -3750 + 'px';

}

if( newLeft < -3750){

list.style.left = -750 + 'px';

}

};

go();

};

//小按钮

for(var i=0;i < buttons.length;i++){

buttons[i].onclick = function(){

if(this.className == 'on'){

return;

};

var myIndex = parseInt(this.getAttribute('index'));

var offset = -750 * (myIndex - index);

animate(offset);

index = myIndex;

showButton();

}

lunBo.onmouseout = play;

lunBo.onmouseover = stop;

play();

}

</script>

</body>

</html>

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原生js焦点轮播图

原生js焦点轮播图主要注意这几点：

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