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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) }
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