这篇文章给大家分享的是有关JavaScript如何实现烟花特效的内容。小编觉得挺实用的，因此分享给大家做个参考，一起跟随小编过来看看吧。
OOA
点击触发事件
烟花运动分成两个阶段
向上飞
爆炸
OOD
class FireWork{
constructor(){
}
bindEvent(){
let _this = this;
ele.onclick = function(){
//fly结束再去调用boom函数
_this.fly(_this.boom);
}
}
fly(boom){
}
boom(){
}
}CSS设计实现
CSS代码
*{
margin: 0;
padding: 0;
}
#box{
width:800px;
height:600px;
position: relative;
margin: 100px auto;
background:#000000;
border:2px solid red;
overflow: hidden;
}
.ball{
width: 40px;
height: 40px;
border-radius: 50%;
position: absolute;
bottom: 0;
}JS编程实现
javascript代码
<script src="./utils.js"></script>
<script>
//
class FireWork{
constructor(){
this.box = document.getElementById("box");
this.box_offset = {
left : box.offsetLeft,
top : box.offsetTop
}
}
bindEvent(){
let _this = this;
this.box.onclick = function( e ){
e = e || event;
_this.x = e.clientX - _this.box_offset.left;
_this.y = e.clientY - _this.box_offset.top;
_this.fly(_this.boom);
}
}
fly( boom ){
let ele = this.createEle();
let _this = this;
// 放入box之中;
ele.style.left = this.x + "px";
let _left = this.x ;
let _top = this.y ;
animate( ele , {
top : this.y
} , function(){
ele.remove();
_this.boom( _left , _top );
});
}
boom( x , y ){
let r = 100;
let count = 0 ;
let _this = this;
for(let i = 0 ; i < 20 ; i ++){
let ele = this.createEle();
ele.style.left = x +"px";
ele.style.top = y + "px";
let _left = parseInt(Math.cos( Math.PI / 10 * i ) * r ) + x ;
let _top = parseInt(Math.sin( Math.PI / 10 * i ) * r) + y
animate( ele , {
left : _left,
top : _top,
opacity : 0
} , function(){
ele.remove();
})
}
}
createEle(){
let ele = document.createElement("div");
ele.className = "ball";
ele.style.backgroundColor = `rgb(${parseInt(Math.random() * 255)},${parseInt(Math.random() * 255)},${parseInt(Math.random() * 255)})`;
this.box.appendChild( ele );
return ele ;
}
}
new FireWork().bindEvent();
</script>引用的utils.js文件
function on(dom, event_name, handler_selector, delegation_handler) {
if( typeof handler_selector === "string" && typeof delegation_handler === "function"){
return delegation(dom, event_name, handler_selector, delegation_handler);
}
// 在dom对象里面建立一个事件名 : 事件处理函数对应的数组;
// 判定当前事件处理函数是否在dom对象之中;
var event_type = "_" + event_name;
if (event_type in dom) {
dom[event_type].push(handler_selector);
} else {
dom[event_type] = [handler_selector];
}
// 如果直接用事件名当成对象之中的key值，那么会和原有的dom功能名称冲突;
// 因为特殊的事件名会导致事件无法触发，所以我们在这里要对事件名进行拆分处理;
dom.addEventListener(event_name.split(".")[0], handler_selector)
}
function off(dom, event_name) {
// 获取到dom对象里面事件名对应的一组事件处理函数;
var callback_list = dom["_" + event_name];
// 根据列表里面的所有函数进行事件移除 ;
callback_list.forEach(function (event_handler) {
dom.removeEventListener(event_name.split(".")[0], event_handler);
})
// 清空dom对象里面的事件处理函数组;
dom["_" + event_name].length = 0;
}
function trigger(dom, event_type) {
dom.dispatchEvent(new Event(event_type));
}
function delegation(dom, event_name, selector, event_handler) {
dom.addEventListener(event_name, function (e) {
e = e || event;
var target = e.target || e.srcElement;
while (target !== dom) {
switch (selector[0]) {
case ".":
if (selector.slice(1) === target.className) {
event_handler.call(target , e )
return;
}
case "#":
if (selector.slice(1) === target.id) {
event_handler.call(target, e)
return;
}
default:
if (selector.toUpperCase() === target.nodeName) {
event_handler.call(target, e)
return;
}
}
target = target.parentNode;
}
})
}
function animate( dom , attrs , callback , transition = "buffer", speed = 10 ){
// transition : 有两种动画方式 "buffer" , "liner"
var _style = getComputedStyle( dom );
// - 1. 数据变形 ;
for(var attr in attrs ){
attrs[attr] = {
target : attrs[attr],
now : _style[attr]
}
// - 2. 速度 : 匀速运动速度正负 ;
if( transition === "liner" ){
attrs[attr].speed = attrs[attr].target > attrs[attr].now ? speed : - speed;
}
if( attr === "opacity"){
attrs[attr].target *= 100
attrs[attr].now *= 100
}else{
attrs[attr].now = parseInt(attrs[attr].now)
}
}
// - 关闭开启定时器;
clearInterval( dom.interval );
dom.interval = setInterval( function(){
for(var attr in attrs ){
// 取出当前值和属性值 ;
// attrs[attr].target : 目标值;
// attrs[attr].now : 当前值;
let { target , now } = attrs[attr];
// 缓冲运动时候的速度;
if( transition === "buffer" ){
var speed = (target - now ) / 10 ;
speed = speed > 0 ? Math.ceil( speed ) : Math.floor( speed );
}else if(transition === "liner"){
var speed = attrs[attr].speed;
}
if( Math.abs(target - now) <= Math.abs( speed ) ){
if( attr === "opacity"){
dom.style[attr] = target / 100;
}else{
dom.style[attr] = target + "px";
}
delete attrs[attr];
for(var attr in attrs ){
// 如果有数据循环会执行至少一次;
return false;
}
clearInterval(dom.interval);
typeof callback === "function" ? callback() : "";
}else{
now += speed;
if( attr === "opacity"){
dom.style[attr] = now / 100;
}else{
dom.style[attr] = now + "px";
}
// 给对象赋值;
attrs[attr].now = now;
}
}
} , 30)
}感谢各位的阅读！关于“JavaScript如何实现烟花特效”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，让大家可以学到更多知识，如果觉得文章不错，可以把它分享出去让更多的人看到吧！
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