轮播--点击图片弹出轮播图：
实现效果：
1.鼠标经过图片改变图片的透明度
2.点击图片，弹出遮罩层
3.点击遮罩层左右箭头，实现轮播；
4.点击遮罩层图片以外的部分，关闭遮罩层html:
`
<'div id="wrap">
`
css:
*{
margin: 0;
padding: 0;
}
img{
border: none;
display: block;
float: left;
}
#wrap{
width: 800px;
height: 400px;
background: #000;
position: absolute;
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
}
#wrap img.smallImg{
float: left;
display: block;
opacity: 0.5;
filter: alpha(opacity=50);
}
#wrap img.cur{
opacity: 1;
filter: alpha(opacity=100);
}
#wrap img.current{
opacity: 1;
filter: alpha(opacity=100);
}使用方法：
jump({
//所有图片的最外层容器的ID
wrapId:'wrap',
//显示图片的最外层容器的ID
itemId:'item',
//遮罩层的最外层容器的ID
zoomId:'zoom',
//遮罩层图片的宽度
width: 1000,
//遮罩层图片的高度
height: 420,
//打开页面显示的小图片
imgsArr:['images/1.jpg','images/2.jpg','images/3.jpg','images/4.jpg','images/5.jpg','images/6.jpg'],
//遮罩层的大图片
bigImgsArr:['images/-1.jpg','images/-2.jpg','images/-3.jpg','images/-4.jpg','images/-5.jpg','images/-6.jpg']
})js：
function jump(option){
//最外层容器
var wrap = document.getElementById(option.wrapId)
//创建显示多张图片的容器
var item = document.createElement('div')
item.setAttribute('id',option.itemId);
wrap.appendChild(item)
// var H = wrap.currentStyle['height']
// var H = parseInt(window.getComputedStyle(wrap, null)['height']) ||
//创建a
for(var i = 0 ; i < option.imgsArr.length; i++){
var newImg = document.createElement('img');
newImg.setAttribute('class','smallImg');
newImg.src = option.imgsArr[i];
item.appendChild(newImg);
}
//创建弹出层
var zoom = document.createElement('div');
zoom.setAttribute('id',option.zoomId);
//设置弹出层样式
setGroupCss(zoom,{
"background":"rgba(0,0,0,.2)",
"position":"fixed",
"left":"0",
"top":"0",
"width":window.innerWidth,
"height":window.innerHeight,
"display":"none"
})
wrap.appendChild(zoom)
//创建轮播图边界
var zoomWrap = document.createElement('div');
zoomWrap.setAttribute('class','zoomWrap');
setGroupCss(zoomWrap,{
"position":"absolute",
"left":"50%",
"top":"50%",
"marginLeft":-option.width/2,
"marginTop":-option.height/2 ,
"width":option.width,
"height":option.height,
"background":"#fff",
"overflow":"hidden",
})
zoom.appendChild(zoomWrap);
//创建轮播图容器
var zoomCon = document.createElement('div');
zoomCon.setAttribute('class','zoomCon');
setGroupCss(zoomCon,{
"position":"absolute",
"left":0,
"top":0,
"width":option.width*7,
"height":option.height,
"overflow":"hidden"
})
zoomWrap.appendChild(zoomCon);
//创建图片
for(var i = 0 ; i < option.bigImgsArr.length; i++){
var newBigImg = document.createElement('img');
newBigImg.src = option.bigImgsArr[i];
newBigImg.setAttribute('class','bigImg');
newBigImg.style.float = 'left';
zoomCon.appendChild(newBigImg);
}
//克隆第一张大图片放到最后
var bigImgs = document.querySelectorAll('.bigImg');
var firstBigImg = bigImgs[0].cloneNode(true);
zoomCon.appendChild(firstBigImg)
//创建右箭头
var arrowR = document.createElement('span');
arrowR.innerHTML = ">";
setGroupCss(arrowR,{
"position":"absolute",
"right":10,
"top":"50%",
"marginTop":-30,
"width":40,
"height":60,
"fontSize":"40px",
"fontFamily":"宋体",
"textAlign":"center",
"lineHeight":"60px",
"fontWeight":"bold",
"cursor":"pointer",
"background":"rgba(0,0,0,.1)",
"color":"#fff",
"zIndex":9999
})
zoomWrap.appendChild(arrowR)
//创建左箭头
var arrowL = document.createElement('span');
arrowL.innerHTML = "<";
setGroupCss(arrowL,{
"position":"absolute",
"left":10,
"top":"50%",
"marginTop":-30,
"width":40,
"height":60,
"fontSize":"40px",
"fontFamily":"宋体",
"textAlign":"center",
"lineHeight":"60px",
"fontWeight":"bold",
"cursor":"pointer",
"background":"rgba(0,0,0,.2)",
"color":"#fff",
"zIndex":9999
})
zoomWrap.appendChild(arrowL)
var Imgs = document.querySelectorAll('.smallImg');
var num = 0;
for(var i = 0 ; i < Imgs.length; i++){
Imgs[i].index = i;
//鼠标移入事件
Imgs[i].onmouseover = function(){
console.log(1111)
for(var j = 0 ; j < Imgs.length; j++){
Imgs[j].className = 'smallImg';
}
this.className += 'cur';
}
//鼠标移除事件
Imgs[i].onmouseout = function(){
this.className = 'smallImg';
}
//点击事件
Imgs[i].onclick = function(e){
var e = e || window.event;
e.stopPropagation()
zoom.style.display = 'block';
zoomCon.style.left = -option.width * this.index + 'px';
num = this.index;
console.log(num)
}
}
//右箭头点击事件
arrowR.onclick = function(e){
var e = e || window.event;
e.stopPropagation()
num++;
if(num > bigImgs.length){
num = 1;
zoomCon.style.left = 0;
}
go(zoomCon,-option.width * num)
}
arrowL.onclick = function(e){
var e = e || window.event;
e.stopPropagation()
num--;
if(num <0){
num = bigImgs.length-1;
zoomCon.style.left = -option.width * (bigImgs.length) + 'px';
}
go(zoomCon,-option.width * num)
}
//点击图片外关闭遮罩层
document.onclick = function(e){
if(e.target.id != option.wrapId || e.srcElement.id){
zoom.style.display = 'none';
}
}
//运动函数
function go(obj,target){
clearInterval(obj.timer)
var speed = obj.offsetLeft < target? 30 : -30;
obj.timer=setInterval(function(){
var result = obj.offsetLeft - target;
obj.style.left=obj.offsetLeft + speed +"px"
if(Math.abs(result) <= 30){
clearInterval(obj.timer);
obj.style.left = target +"px"
}
},10)
}
//设置多个css样式
function setGroupCss(ele,options){
//判断json是否是对象类型
if(Object.prototype.toString.call(options) !=='[object Object]'){
console.log('aaaa')
return;
}
//遍历options的么一项，使用setCss()一一设置
for(var key in options){
if(options.hasOwnProperty(key)){
setCss(ele,key,options[key])
}
}
}
//设置单个css样式
function setCss(ele,attr,value){
//设置float
if(attr === 'float'){
ele['style']['cssFloat'] = value;
ele['style']['styleFloat'] = value;
return;
};
//设置opacity
if(attr === 'opacity'){
console.log(111)
ele['style']['opacity'] = value;
ele['style']['filter'] = 'alpha(opacity='+ value*100+')';
return;
};
//传递的value需要加单位的自动补充上；
var reg = /^(width|height|top|bottom|left|right|((margin|pading)(Top|Bottom|Left|Right)?))$/;
if(reg.test(attr)){
//如果传递的value没有加单位就补充上单位；如果加了单位就不再处理
if(!isNaN(value)){ //判断value是否是一个有效数字，如果是有效数字，就加单位
value += 'px';
}
}
ele['style'][attr] = value;
}
}