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定义一个banner.js文件，代码如下
;window.requestAnimationFrame = window.requestAnimationFrame||function(a){return setTimeout(a,1000/60)};
window.cancelAnimationFrame = window.cancelAnimationFrame||clearTimeout;
var FragmentBanner = function(option) {
//实例化时，可传的参数
this.whiteList = ['container','controller','size','imgs','size','grid','index','fnTime','boxTime','type'];
//容器将包容控制器
this.container = '.banner';
//默认的控制器
this.controller = {
view : '.banner-view',
btn : '.banner-btn',
num : '.banner-number',
progre : '.banner-progres'
};
//栅格 行*列
this.grid = {
line : 5,
list : 10
};
//容器的大小
this.size = {
width : 1200,
height : 675,
};
//切换类型
this.type = 1;
//索引位置
this.index = 0;
//函数每次切换时间
this.fnTime = 5000;
//栅格每次运动时间
this.boxTime = 2000;
//栅格运动结束的时间
this.activeTime = new Date();
for(var a = 0,attrLenght = this.whiteList.length; a < attrLenght;a++){
var attr = this.whiteList[a];
if(option[attr] != undefined){
this[attr] = option[attr];
}
}
for(var i in option){
if(this.whiteList[i] !== undefined){ ; }
}
init();
}
function setIndex(){
this.index %= this.imgs.length;
this.index = (this.index < 0) ? this.imgs.length - 1 : this.index;
this.elem.numFind[this.index].className = 'on';
}
function init(){
this.container = document.querySelector(this.container)
if(!this.container){
return alert('获取banner容器失败');
}else{
this.container.style.width = this.size.width+'px';
this.container.style.height = this.size.height+'px';
}
this.elem = {};
for(var e in this.controller){
this.elem[e] = this.container.querySelector(this.controller[e]);
if(this.elem[e] == null){
return alert('获取'+e+'容器');
}
}
//栅格
var w = this.size.width / this.grid.list,
h = this.size.height / this.grid.line;
this.elem.viewBox = new Array();
for(var i = 0,iL = this.grid.line;i < iL;i++){
for(var j = 0,jL = this.grid.list;j < jL;j++){
var newI = document.createElement('i');
setCss(newI,{
width : w+'px',
height : h+'px',
left : 0,
top : 0,
opacity : 1,
backgroundImage : 'url("'+this.imgs[this.index]+'")',
backgroundSize : this.size.width + 'px ' + this.size.height +'px',
backgroundPosition : w * -j+'px ' + h * -i+'px'
});
this.elem.view.appendChild(newI);
this.elem.viewBox.push(newI);
}
}
//按钮动作
for (var b = 1; b >= 0; b--) {
var oB = document.createElement('span');
(b) ? oB.innerHTML = '<' : oB.innerHTML = '>';
oB.setIndex = b;
oB.onclick = function(obj){
show({
switch : true,
change : obj.setIndex == 0
});
}.bind(this,oB);
this.elem.btn.appendChild(oB);
}
//数量
for(var n = 0,nL = this.imgs.length; n < nL;n++){
var oI = document.createElement('i');
oI.setIndex = n;
oI.onclick = function(obj){
//显示动画
show({
switch : true,
change : obj.setIndex
});
}.bind(this,oI)
this.elem.num.appendChild(oI);
}
this.elem.numFind = this.elem.num.querySelectorAll('i');
//进度条
this.progre = new Array;
for(var p = 1;p >= 0;p--){
var oP = document.createElement('i');
setCss(oP,{
width : 0,
backgroundColor : p ? '#00c3ff' : '#ffc300'
});
this.elem.progre.appendChild(oP);
this.progre.push(oP);
}
//显示动画
show();
this.elem.numFind[this.index].className = 'on';
}
function setCss(obj,json){
for( c in json){
if(c == 'opacity'){
obj.style.opacity = c;
obj.style.filter = "alpha(opacity="+ (json[c]*100) +")";
}else{
obj.style[c] = json[c];
}
}
return this;
}
function show(order){
order = order || {};
if(new Date() >= this.activeTime){
this.elem.numFind[this.index].className = '';
// 下次播放动画时候的进度条
setCss(this.progre[1],{width : 0})
anime(this.progre[1],{
width : this.size.width
},this.fnTime,function(){
show({
switch : true,
change : true
});
}.bind(this));
var status = true,
activeTime = 0;
for( var i = 0,iL = this.elem.viewBox.length;i < iL;i++ ){
var startTime = getTypeTime(),
endTime = getTypeTime(),
obj = this.elem.viewBox[i];
activeTime = Math.max(activeTime,startTime[1] + endTime[1]);
anime(obj,{
left : Math.ceil(Math.random() * this.size.width * 2 - this.size.width),
top : Math.ceil(Math.random() * this.size.height * 2 - this.size.height),
opacity: 0
}, startTime[0] ,function(obj){
if(order.switch && status){
if(/number/i.test(typeof order.change)){
this.index = order.change;
}else{
(order.change) ? ++this.index : --this.index;
}
setIndex();
this.elem.numFind[this.index].className = 'on';
status = false;
}
setCss(obj,{backgroundImage : 'url("'+this.imgs[this.index]+'")'})
anime(obj,{
left : 0,
top : 0,
opacity : 1
},endTime[0]);
}.bind(this,obj));
}
//栅格结束运动的时间
this.activeTime = new Date(new Date().getTime() + activeTime);
setCss(this.progre[0],{width : 0})
anime(this.progre[0],{width : this.size.width},activeTime);
}
}
function getTypeTime(){
var timer = new Array();
switch(this.type){
case 1:
timer.push(this.boxTime / 4 + Math.random() * this.boxTime / 4);
timer.push(timer[0]);
break;
default:
timer.push([Math.random() * this.boxTime / 5,this.boxTime / 10 * 3]);
timer.push(timer[0][0] + timer[0][1]);
break;
}
return timer;
}
function anime(obj,attr,endTime,callback) {
(obj.timer) && cancelAnimationFrame(obj.timer);
var cssJosn = obj.currentStyle || getComputedStyle(obj,null),
start = {},end = {},goTime;
//设置初始属性值和结束属性值
for(var key in attr){
if(attr[key] != parseFloat(cssJosn[key])){
start[key] = parseFloat(cssJosn[key]);
end[key] = attr[key] - start[key];
}
}
goTime = new Date();
if(endTime instanceof Array){
(function delayFn(){
if((new Date() - goTime) >= endTime[0]){
endTime = endTime[1];
goTime = new Date();
ref();
}else{
obj.timer = requestAnimationFrame(delayFn);
}
})();
}else{
ref();
}
function ref(){
var prop = (new Date() - goTime) / endTime;
(prop >= 1) ? prop = 1 : obj.timer = requestAnimationFrame(ref);
for(var key in start){
var val = -end[key] * prop *(prop-2) + start[key];
if(key == 'opacity'){
obj.style.opacity = val;
obj.style.filter = "alpha(opacity="+ (val*100) +")";
}else{
obj.style[key] = val+'px';
}
}
(prop === 1) && callback && callback.call(obj);
};
}
module.exports.FragmentBanner = FragmentBanner;在需要的组件里面引入改js
import {FragmentBanner} from '../../../static/js/banner.js'
使用方式如下
