写在前面
天热多喝水，有利于我们的身体健康，但是，为了保证我们每天喝满8杯水，共计2000毫升，如果换算成一瓶500毫升的矿泉水的话，那就是，我们每天要喝4瓶水，这么热的天，我觉得还是可以完成的，甚至是不够的。
但是，如果我们为了方便记录自己每天喝了多少水的话，我们可以通过一个小练习来实现，以下就是我们今天需要练习的内容。
我们先来看一下最终效果：
接下来，再来看一下具体实现代码。
HTML代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>【每日一练】45—记录喝水量动画效果的实现</title>
</head>
<body>
<h1>一天喝8杯水</h1>
<h3>总水量：2升</h3>
<div class="cup">
<div class="remained" id="remained">
<span id="liters"></span>
<small>剩余水量</small>
</div>
<div class="percentage" id="percentage"></div>
</div>
<p class="text">记录你的喝水量</p>
<div class="cups">
<div class="cup cup-small">250 ml</div>
<div class="cup cup-small">250 ml</div>
<div class="cup cup-small">250 ml</div>
<div class="cup cup-small">250 ml</div>
<div class="cup cup-small">250 ml</div>
<div class="cup cup-small">250 ml</div>
<div class="cup cup-small">250 ml</div>
<div class="cup cup-small">250 ml</div>
</div>
</body>
</html> CSS代码：
:root {
--border-color: #144fc6;
--fill-color: #6ab3f8;
}
* {
box-sizing: border-box;
}
body {
background-color: #3494e4;
color: #fff;
font-family: 'Montserrat', sans-serif;
display: flex;
flex-direction: column;
align-items: center;
margin-bottom: 40px;
}
h1 {
margin: 10px 0 0;
}
h3 {
font-weight: 400;
margin: 10px 0;
}
.cup {
background-color: #fff;
border: 4px solid var(--border-color);
color: var(--border-color);
border-radius: 0 0 40px 40px;
height: 330px;
width: 150px;
margin: 30px 0;
display: flex;
flex-direction: column;
overflow: hidden;
}
.cup.cup-small {
height: 95px;
width: 50px;
border-radius: 0 0 15px 15px;
background-color: rgba(255, 255, 255, 0.9);
cursor: pointer;
font-size: 14px;
align-items: center;
justify-content: center;
text-align: center;
margin: 5px;
transition: 0.3s ease;
}
.cup.cup-small.full {
background-color: var(--fill-color);
color: #fff;
}
.cups {
display: flex;
flex-wrap: wrap;
align-items: center;
justify-content: center;
width: 280px;
}
.remained {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
text-align: center;
flex: 1;
transition: 0.3s ease;
}
.remained span {
font-size: 20px;
font-weight: bold;
}
.remained small {
font-size: 12px;
}
.percentage {
background-color: var(--fill-color);
display: flex;
align-items: center;
justify-content: center;
font-weight: bold;
font-size: 30px;
height: 0;
transition: 0.3s ease;
}
.text {
text-align: center;
margin: 0 0 5px;
} JS代码：
const smallCups = document.querySelectorAll('.cup-small')
const liters = document.getElementById('liters')
const percentage = document.getElementById('percentage')
const remained = document.getElementById('remained')
updateBigCup()
smallCups.forEach((cup, idx) => {
cup.addEventListener('click', () => highlightCups(idx))
})
function highlightCups(idx) {
if (idx===7 && smallCups[idx].classList.contains("full")) idx--;
else if(smallCups[idx].classList.contains('full') && !smallCups[idx].nextElementSibling.classList.contains('full')) {
idx--
}
smallCups.forEach((cup, idx2) => {
if(idx2 <= idx) {
cup.classList.add('full')
} else {
cup.classList.remove('full')
}
})
updateBigCup()
}
function updateBigCup() {
const fullCups = document.querySelectorAll('.cup-small.full').length
const totalCups = smallCups.length
if(fullCups === 0) {
percentage.style.visibility = 'hidden'
percentage.style.height = 0
} else {
percentage.style.visibility = 'visible'
percentage.style.height = `${fullCups / totalCups * 330}px`
percentage.innerText = `${fullCups / totalCups * 100}%`
}
if(fullCups === totalCups) {
remained.style.visibility = 'hidden'
remained.style.height = 0
} else {
remained.style.visibility = 'visible'
liters.innerText = `${2 - (250 * fullCups / 1000)}L`
}
} 写在最后
以上就是今天【每日一练】的全部内容，希望今天的小练习对你有用，如果你觉得有帮助的话，请点赞我，关注我，并将它分享给你身边做开发的朋友，也许能够帮助到他。
我是杨小爱，我们明天见。