午饭时间,暗恋已久的学妹拉着我的衣袖:“学长学长,你能不能让这些爱心变成五颜六色的吗~”。 我在旁边笑开了花~~~
诶呀,口水流出来了。 嗯,只是我脑补的画面,哈哈。 我想最终效果是这样的(猜猜多少个爱心):
然后开始动手吧~
本文将带大家学习两个好东西: 1.生成随机色的方法; 2.Element.animate() 方法。 当然,还有撩妹技巧了~
爱心怎么画,不是咱们本文重点,so,SVG搞起:
<div id="heart">
<svg t="1587910011145" class="icon" viewBox="0 0 1024 1024" version="1.1"
xmlns="http://www.w3.org/2000/svg" p-id="1253" width="32" height="32"
>
<path d="M677.51936 192.03072c113.1008 0 204.8 91.6992 204.8 204.77952 0
186.91072-370.3296 435.15904-370.3296 435.15904S141.68064 592.67072 141.68064
396.81024c0-140.78976 91.6992-204.77952 204.77952-204.77952 68.11648 0
128.28672 33.40288 165.5296 84.55168C549.24288 225.4336 609.41312 192.03072
677.51936 192.03072z" p-id="1254"
></path>
</svg>
</div>
小爱心出来了:
现在删除到之前的 SVG 标签,换成动态生成咯~~
let heartList = '';
const n = 99;
for(let i = 0; i <= n; i++){
heartList += `
<svg t="1587910011145" class="icon" viewBox="0 0 1024 1024" version="1.1"
xmlns="http://www.w3.org/2000/svg" p-id="1253" width="32" height="32">
<path d="M677.51936 192.03072c113.1008 0 204.8 91.6992 204.8 204.77952 0
186.91072-370.3296 435.15904-370.3296 435.15904S141.68064 592.67072 141.68064
396.81024c0-140.78976 91.6992-204.77952 204.77952-204.77952 68.11648 0
128.28672 33.40288 165.5296 84.55168C549.24288 225.4336 609.41312 192.03072
677.51936 192.03072z" p-id="1254"
></path>
</svg>
`
}
document.getElementById('heart').innerHTML = heartList;
一大堆小爱心出现啦:
接下来我们要打造一把魔法棒,能让我们这些小爱心变成各种各样的颜色。 没错,这把魔法棒,就是用来生成随机颜色。 方法很多,我搜集以下几种简单好用的生成随机颜色的方法,基本我们业务随便一个都能用:
function getRandomColor(){
const r = Math.floor(Math.random()*255);
const g = Math.floor(Math.random()*255);
const b = Math.floor(Math.random()*255);
return 'rgba('+ r +','+ g +','+ b +',0.8)';
}
function getRandomColor(){
return '#'+Math.floor(Math.random()*16777215).toString(16);
}
function getRandomColor(){
return '#' + (function(color){
return (color += '0123456789abcdef'[Math.floor(Math.random()*16)])
&& (color.length == 6) ? color : arguments.callee(color);
})('');
}
function getRandomColor(){
return '#'+'0123456789abcdef'.split('').map(
(v,i,a) => i>5 ? null : a[Math.floor(Math.random()*16)]
).join('');
}
function getRandomColor(){
return '#'+('00000'+(Math.random()*0x1000000<<0).toString(16)).slice(-6);
}
function getRandomColor(){
const colorAngle = Math.floor(Math.random()*360);
return 'hsla('+ colorAngle +',100%,50%,1)';
}
function getRandomColor(){
return (function(m,s,c){
return (c ? arguments.callee(m,s,c-1) : '#') +
s[m.floor(m.random() * 16)]
})(Math,'0123456789abcdef',5)
}
随机色真好玩~
最后,我们修改前面 SVG 的代码片段,加入 getRandomColor
方法的调用:
for(let i = 0; i <= n; i++){
heartList += `
<svg t="1587910011145" class="icon" viewBox="0 0 1024 1024" version="1.1"
xmlns="http://www.w3.org/2000/svg" p-id="1253" width="32" height="32"
fill="${getRandomColor()}"
>
<path d="M677.51936 192.03072c113.1008 0 204.8 91.6992 204.8 204.77952 0
186.91072-370.3296 435.15904-370.3296 435.15904S141.68064 592.67072 141.68064
396.81024c0-140.78976 91.6992-204.77952 204.77952-204.77952 68.11648 0
128.28672 33.40288 165.5296 84.55168C549.24288 225.4336 609.41312 192.03072
677.51936 192.03072z" p-id="1254"
></path>
</svg>
`
}
99 个小爱心,水灵灵的!
这时候,每个爱心都静静躺着页面,是时候让它们动起来啦,为了学妹~ 继续改造前面 SVG 代码,为每个 SVG 标签添加连续 ID 值:
for(let i = 0; i <= n; i++){
heartList += `
<svg id="heart_${i}" t="1587910011145" class="icon" viewBox="0 0 1024 1024" version="1.1"
xmlns="http://www.w3.org/2000/svg" p-id="1253" width="32" height="32"
fill="${getRandomColor()}"
>
<path d="M677.51936 192.03072c113.1008 0 204.8 91.6992 204.8 204.77952 0
186.91072-370.3296 435.15904-370.3296 435.15904S141.68064 592.67072 141.68064
396.81024c0-140.78976 91.6992-204.77952 204.77952-204.77952 68.11648 0
128.28672 33.40288 165.5296 84.55168C549.24288 225.4336 609.41312 192.03072
677.51936 192.03072z" p-id="1254"
></path>
</svg>
`
}
生命随机放大倍数,并设置动画效果:
let getRandomNum = () => Math.floor(Math.random()*2+1);
setTimeout(function(){
for (let i = 0; i <= n; i++) {
const item = `heart_${i}`;
document.getElementById(item).animate([
// keyframes translateY(0px)
{ transform: `scale(${getRandomNum()})` },
{ transform: `scale(${getRandomNum()})` },
{ transform: `scale(${getRandomNum()})` },
{ transform: `scale(${getRandomNum()})` },
{ transform: `scale(${getRandomNum()})` },
{ transform: `scale(${getRandomNum()})` },
], {
// timing options
duration: 5000,
iterations: Infinity
});
}
}, 100)
然后,小爱心们动起来啦。
接下来,要让这些小爱心飞起来~
下面贴代码。
html,body{
overflow: hidden;
width: 100%;
height: 100%;
margin: 0;
}
#heart{
position: relative;
}
.item{
position: absolute;
}
逻辑修改:
let heartList = '';
const n = 666; // 总爱心数
// 生成随机颜色
function getRandomColor() {
return (function (m, s, c) {
return (c ? arguments.callee(m, s, c - 1) : '#') +
s[m.floor(m.random() * 16)]
})(Math, '0123456789abcdef', 5)
}
// 生成爱心列表
for(let i = 0; i <= n; i++){
heartList += `
<svg id="heart_${i}" class="item" t="1587910011145" class="icon" viewBox="0 0 1024 1024" version="1.1"
xmlns="http://www.w3.org/2000/svg" p-id="1253" width="32" height="32"
fill="${getRandomColor()}"
>
<path d="M677.51936 192.03072c113.1008 0 204.8 91.6992 204.8 204.77952 0
186.91072-370.3296 435.15904-370.3296 435.15904S141.68064 592.67072 141.68064
396.81024c0-140.78976 91.6992-204.77952 204.77952-204.77952 68.11648 0
128.28672 33.40288 165.5296 84.55168C549.24288 225.4336 609.41312 192.03072
677.51936 192.03072z" p-id="1254"
></path>
</svg>
`
}
// 随机放大倍数
const getRandomNum = (scale) => Math.floor(Math.random()*scale+1);
const boxWidth = window.innerWidth;
const boxHeight = window.innerHeight;
setTimeout(function(){
for (let i = 0; i <= n; i++) {
const item = `heart_${i}`;
const width = getRandomNum(boxWidth);
const height = getRandomNum(boxHeight);
const cWidth = getRandomNum(1000) - width;
const cHeight = getRandomNum(1000) - height;
document.getElementById(item).animate([
{ transform: `scale(${getRandomNum(2)})`,left: `0px`, top: `0px` },
{ transform: `scale(${getRandomNum(2)})`,left: `${boxWidth/2}px`, top: `${boxHeight/2}px` },
{ transform: `scale(${getRandomNum(2)})`,left: `${cWidth * 2}px`, top: `${cHeight * 2}px` },
], {
duration: 9000,
iterations: Infinity,
easing: 'ease-in-out'
});
}
}, 100)
document.getElementById('heart').innerHTML = heartList;
聪明的你,再配上BGM,浪漫~
继续~ 对了,送给学妹的代码我放在仓库: https://github.com/pingan8787/Leo-JavaScript/blob/master/Leo-Demo/7-WeiteHeartPop.html
END