JS放烟花
前端老实人 人气:0雷迪森安的乡亲们，欢迎来到老实人的前端课堂，上次写了一个新春小盲盒，这大过年的，我把烟花都给你们准备好了，今天我们来写个小烟花吧。
效果展示
注意看有两种模式哦，可以自由切换，鼠标点哪里哪里有烟花，还可以自动放烟花
实现代码
Html
<div id="tips">
<a id="manual" href="javascript:;" rel="external nofollow" rel="external nofollow" >手动放烟花</a>
<a id="auto" href="javascript:;" rel="external nofollow" rel="external nofollow" >自动放烟花</a>
</div>
Css
以下样式大部分是js代码渲染上dom后表现出来的
html,
body {
overflow: hidden;
}
body,
div,
p {
margin: 0;
padding: 0;
}
body {
background: #000;
font: 12px/1.5 arial;
color: #7A7A7A;
}
a {
text-decoration: none;
outline: none;
}
#tips,
#copyright {
position: absolute;
width: 100%;
height: 50px;
text-align: center;
background: #171717;
border: 2px solid #484848;
}
#tips {
top: 0;
border-width: 0 0 2px;
}
#tips a {
font: 14px/30px arial;
color: #FFF;
background: #F06;
display: inline-block;
margin: 10px 5px 0;
padding: 0 15px;
border-radius: 15px;
}
#tips a.active {
background: #FE0000;
}
#copyright {
bottom: 0;
line-height: 50px;
border-width: 2px 0 0;
}
#copyright a {
color: #FFF;
background: #7A7A7A;
padding: 2px 5px;
border-radius: 10px;
}
#copyright a:hover {
background: #F90;
}
p {
position: absolute;
top: 55px;
width: 100%;
text-align: center;
}
JavaScript
var fgm = {
on: function (element, type, handler) {
return element.addEventListener ? element.addEventListener(type, handler, false) : element.attachEvent("on" + type, handler)
},
un: function (element, type, handler) {
return element.removeEventListener ? element.removeEventListener(type, handler, false) : element.detachEvent("on" + type, handler)
},
bind: function (object, handler) {
return function () {
return handler.apply(object, arguments)
}
},
randomRange: function (lower, upper) { //产生范围在lower~upper的随机数
return Math.floor(Math.random() * (upper - lower + 1) + lower)
},
getRanColor: function () { //随机获得十六进制颜色
var str = this.randomRange(0, 0xFFFFFF).toString(16);
while (str.length < 6) str = "0" + str;
return "#" + str
}
};
//初始化对象
function FireWorks() {
this.type = 0;
this.timer = null;
this.fnManual = fgm.bind(this, this.manual)
}
FireWorks.prototype = {
initialize: function () {
clearTimeout(this.timer);
fgm.un(document, "click", this.fnManual);
switch (this.type) {
case 1:
fgm.on(document, "click", this.fnManual);
break;
case 2:
this.auto();
break;
};
},
manual: function (event) {
event = event || window.event;
this.__create__({
x: event.clientX,
y: event.clientY
});
},
auto: function () {
var that = this;
that.timer = setTimeout(function () {
that.__create__({
x: fgm.randomRange(50, document.documentElement.clientWidth - 50),
y: fgm.randomRange(50, document.documentElement.clientHeight - 150)
})
that.auto();
}, fgm.randomRange(900, 1100))
},
__create__: function (param) {
//param即鼠标点击点（即烟花爆炸点）
var that = this;
var oEntity = null;
var oChip = null;
var aChip = [];
var timer = null;
var oFrag = document.createDocumentFragment();
oEntity = document.createElement("div");
with (oEntity.style) { //烟花上升过程实体初始化
position = "absolute";
//初始位置距网页顶部为：整个网页的高度（处于网页底部）
top = document.documentElement.clientHeight + "px";
left = param.x + "px";
width = "4px";
height = "30px";
borderRadius = "4px";
background = fgm.getRanColor();
};
document.body.appendChild(oEntity);
//window.setInterval方法 该方法使得一个函数每隔固定时间被调用一次
// console.log(param.y);
oEntity.timer = setInterval(function () {
// console.log(oEntity.offsetTop);
// console.log(oEntity.style.top);
oEntity.style.top = oEntity.offsetTop - 20 + "px";
//判断烟花是否上升到或者第一次超过上次鼠标点击位置
if (oEntity.offsetTop <= param.y) {
//烟花爆炸
clearInterval(oEntity.timer);
document.body.removeChild(oEntity);
(function () {
//在50-100之间随机生成碎片
//由于IE浏览器处理效率低, 随机范围缩小至20-30
//自动放烟花时, 随机范围缩小至20-30
var len = (/msie/i.test(navigator.userAgent) || that.type == 2) ? fgm.randomRange(20, 30) : fgm.randomRange(50, 100)
//产生所有烟花爆炸颗粒实体
for (i = 0; i < len; i++) {
//烟花颗粒形态实体
oChip = document.createElement("div");
with (oChip.style) {
position = "absolute";
top = param.y + "px";
left = param.x + "px";
width = "4px";
height = "4px";
overflow = "hidden";
borderRadius = "4px";
background = fgm.getRanColor();
};
oChip.speedX = fgm.randomRange(-20, 20);
oChip.speedY = fgm.randomRange(-20, 20);
oFrag.appendChild(oChip);
aChip[i] = oChip
};
document.body.appendChild(oFrag);
timer = setInterval(function () {
for (i = 0; i < aChip.length; i++) {
var obj = aChip[i];
with (obj.style) {
top = obj.offsetTop + obj.speedY + "px";
left = obj.offsetLeft + obj.speedX + "px";
};
obj.speedY++;
//判断烟花爆炸颗粒是否掉落至窗体之外，为真则remove
//splice() 方法可删除从 index 处开始的零个或多个元素
(obj.offsetTop < 0 || obj.offsetLeft < 0 || obj.offsetTop > document.documentElement.clientHeight || obj.offsetLeft > document.documentElement.clientWidth) && (document.body.removeChild(obj), aChip.splice(i, 1))
};
//判断烟花爆炸颗粒是否全部remove，为真则clearInterval(timer);
!aChip[0] && clearInterval(timer);
}, 30)
})()
}
}, 30)
}
};
fgm.on(window, "load", function () {
var oTips = document.getElementById("tips");
var aBtn = oTips.getElementsByTagName("a");
var oFireWorks = new FireWorks();
fgm.on(oTips, "click", function (event) {
var oEvent = event || window.event;
var oTarget = oEvent.target || oEvent.srcElement;
var i = 0;
if (oTarget.tagName.toUpperCase() == "A") {
for (i = 0; i < aBtn.length; i++) aBtn[i].className = "";
switch (oTarget.id) {
case "manual":
oFireWorks.type = 1;
break;
case "auto":
oFireWorks.type = 2;
break;
case "stop":
oFireWorks.type = 0;
break;
}
oFireWorks.initialize();
oTarget.className = "active";
//阻止浏览器默认的事件冒泡行为
oEvent.stopPropagation ? oEvent.stopPropagation() : oEvent.cancelBubble = true
}
});
});
fgm.on(document, "contextmenu", function (event) {
var oEvent = event || window.event;
oEvent.preventDefault ? oEvent.preventDefault() : oEvent.returnValue = false
});
关键代码，满满注释哦，这我可够意思了哈，不懂的话再私下问我吧。
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