JS特效----图片轮播
Posted 石佳灵
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<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
* {
margin: 0px;
padding: 0px;
}
#stage {
width: 500px;
height: 300px;
border: 3px solid black;
margin: 100px;
overflow: hidden;
position: relative;
}
#banner {
width: 3000px;
height: 300px;
background-color: rosybrown;
}
.items {
width: 500px;
height: 300px;
color: white;
font-size: 150px;
text-align: center;
line-height: 300px;
float: left;
}
.btn-l,
.btn-r {
width: 50px;
height: 300px;
background-color: black;
opacity: 0.5;
color: white;
font-size: 40px;
line-height: 300px;
text-align: center;
position: absolute;
top: 0px;
}
.btn-l {
left: 0px;
}
.btn-r {
right: 0px;
}
.btn-l:hover,
.btn-r:hover {
cursor: pointer;
opacity: 0.2;
}
.points {
position: absolute;
bottom: 10px;
left: 200px;
/*background-color: orangered;*/
width: 125px;
height: 20px;
}
.dot {
width: 15px;
height: 15px;
border-radius: 50%;
background-color: gainsboro;
float: left;
margin-right: 5px;
cursor: pointer;
}
.active {
background-color: red;
}
</style>
</head>
<body>
<div id="stage">
<div class="btn-l">
<</div>
<div class="btn-r">></div>
<div id="banner">
<div class="items" style="background-color: red;">1</div>
<div class="items" style="background-color: blueviolet;">2</div>
<div class="items" style="background-color: green;">3</div>
<div class="items" style="background-color: yellow;">4</div>
<div class="items" style="background-color: brown;">5</div>
<div class="items" style="background-color: red;">1</div>
</div>
<div class="points">
<div data="1" class="dot active"></div>
<div data="2" class="dot"></div>
<div data="3" class="dot"></div>
<div data="4" class="dot"></div>
<div data="5" class="dot"></div>
</div>
</div>
</body>
</html>
<script>
//取对象
var btn_l = document.getElementsByClassName(‘btn-l‘)[0];
var btn_r = document.getElementsByClassName("btn-r")[0];
var banner = document.getElementById("banner");
var dots = document.getElementsByClassName(‘dot‘);
//定义变量
var count = 1;
var arr = [];
//右侧按钮点击事件
btn_r.onclick = function() {
if(count < 6) {
count++;
arr.push(window.setInterval("move_left()", 20));
} else if(count == 6) {
count = 1;
banner.style.marginLeft = 0 + ‘px‘;
count++;
arr.push(window.setInterval("move_left()", 20));
}
for(var i = 0; i < dots.length; i++) {
dots[i].setAttribute("class", "dot");
}
dots[count - 1].setAttribute("class", "dot active");
}
//左侧按钮点击事件
btn_l.onclick = function() {
if(count > 1) {
count--;
arr.push(window.setInterval("move_right()", 20));
}else if(count == 1){
count = 6;
banner.style.marginLeft = -2500 + ‘px‘;
count--;
arr.push(window.setInterval("move_right()", 20));
}
for(var i = 0; i < dots.length; i++) {
dots[i].setAttribute("class", "dot");
}
dots[count - 1].setAttribute("class", "dot active");
}
//向左移动
function move_left() {
if(banner.offsetLeft == (count - 1) * (-500)) {
clear();
} else {
banner.style.marginLeft = banner.offsetLeft - 20 + "px";
}
}
//向右移动
function move_right() {
if(banner.offsetLeft == (count - 1) * (-500)) {
clear();
} else {
banner.style.marginLeft = banner.offsetLeft + 20 + "px";
}
}
//清除所有间隔执行
function clear() {
for(var x in arr) {
window.clearInterval(arr[x]);
}
}
//批量添加点击事件
for(var j = 0; j < dots.length; j++) {
dots[j].onclick = function() {
count_s = this.getAttribute("data");
if(count > count_s) {
count = count_s;
arr.push(window.setInterval("move_right()", 20));
} else if(count < count_s) {
count = count_s;
arr.push(window.setInterval("move_left()", 20));
}
for(var i = 0; i < dots.length; i++) {
dots[i].setAttribute("class", "dot");
}
this.setAttribute("class", "dot active");
}
}
//自动轮播
function auto_move(){
if(count < 6) {
count++;
arr.push(window.setInterval("move_left()", 20));
} else if(count == 6) {
count = 1;
banner.style.marginLeft = 0 + ‘px‘;
count++;
arr.push(window.setInterval("move_left()", 20));
}
for(var i = 0; i < dots.length; i++) {
dots[i].setAttribute("class", "dot");
}
dots[count - 1].setAttribute("class", "dot active");
}
window.setInterval("auto_move()",3000);
</script>
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