javascript - Javascript 从 unsplash api 更新背景图像的时间太长
问题描述
在 background() 函数中查看 js。从字面上看，更新背景图像需要花费 2 秒的时间，这看起来不太好。请帮助我如何改进它。
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html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<link rel="stylesheet" href="style.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.2/css/all.min.css">
<link rel="preconnect" href="https://fonts.gstatic.com">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootswatch@4.5.2/dist/litera/bootstrap.min.css"
integrity="sha384-enpDwFISL6M3ZGZ50Tjo8m65q06uLVnyvkFO3rsoW0UC15ATBFz3QEhr3hmxpYsn" crossorigin="anonymous">
</head>
<body>
<h1 class="text-center mt-3">My WEATHER APP</h1>
<div class="inputcity">
<input type="text" id="cityname" name="cityname" placeholder="Enter City Name">
<button type="submit" class="button" onclick="city()">Submit</button>
</div>
<div class="center">
<div class="card ">
<div class="top">
<a href="#" class="source">View Page Source</a>
<div class="descr">
<div class="weather-icon"><img src="icons/unknown.png" /></div>
<h3 class="weath-descr font-weight-bold">Clear Skies</h3>
</div>
</div>
<div class="bottom">
<h1 class="city">
<div class="loc">Mansa, Punjab, IN</div>
</h1>
<p class="date">11.21 AM. 02-02-2021</p>
<h1 class="temp">32.00 C</h1>
<p class="minmax"><span class="min"> Min 5C</span> || <span class="max"> Max 35C</span></p>
</div>
<footer>Created By :Khagesh Bansal</footer>
</div>
</div>
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.1/moment.min.js"></script>
<script src="script.js"></script>
</html>
css
*{
padding: 0;
box-sizing: border-box;
}
body{
font-family:-apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}
.center{
display:flex;
justify-content: center;
align-items: center;
display: none;
}
.inputcity{
display:flex;
margin: 5px 70px 30px 70px;
}
input[type=text] {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
box-sizing: border-box;
}
.button {
background-color: #4CAF50; /* Green */
border: none;
color: white;
padding: 15px 32px;
text-align: center;
text-decoration: none;
display: inline-block;
font-size: 16px;
margin: 4px 2px;
cursor: pointer;
}
.card{
width: 37vw;
background: white;
box-shadow: 5px 5px 15px black;
border-radius: 10px;
}
.source{
position: absolute;
colon:white;
top: 0;
right: 0;
margin: 5px;
}
.top{
position: relative;
background-color: skyblue;
height: 30vh;
display:flex;
justify-content: center;
align-items: center;
border-radius: 10px 10px 0 0;
}
.fa-sun{
color: rgb(214, 181, 108);
font-size: 600%;
animation: mymove 6s linear infinite;
}
.descr{
display: flex;
justify-content: center;
align-items: center;
}
@keyframes mymove {
0% {font-size: 650%;}
50%{font-size: 450%;}
100%{font-size: 650%;}
}
.bottom{
display:flex;
justify-content: center;
align-items: center;
flex-direction: column;
background:rgb(179, 197, 231);
position: relative;
}
footer{
background: black;
color: grey;
padding: 3px;
font-size: medium;
border-radius: 0 0 10px 10px;
display:flex;
justify-content: center;
align-items: center;
font-size: medium;
}
.temp{ animation: heartbeat 3s ease-in-out infinite both;
font-size: xxx-large;
}
@keyframes temp {
0% {margin-left: -50px;}
50%{margin-left: 50px;}
100%{margin-left: -50px;}
}
@media only screen and (max-width: 768px) {
/* For mobile phones: */
.card{
width: 95%;
}
}
@keyframes heartbeat {
from {
transform: scale(1);
transform-origin: center center;
animation-timing-function: ease-out;
}
10% {
transform: scale(0.91);
animation-timing-function: ease-in;
}
17% {
transform: scale(0.98);
animation-timing-function: ease-out;
}
33% {
transform: scale(0.87);
animation-timing-function: ease-in;
}
45% {
transform: scale(1);
animation-timing-function: ease-out;
}
}
javascript
date = document.querySelector(".date");
temp = document.querySelector(".temp");
loc = document.querySelector(".loc");
min = document.querySelector(".min");
max = document.querySelector(".max");
locationIcon = document.querySelector('.weather-icon');
cityname = document.getElementById("cityname");
weathdescr=document.querySelector(".weath-descr");
//moment js for time function
function time() {
var d = moment().format('Do-MMM-YY, h:mm:ss a dddd');
date.innerHTML = d;
}
time();
setInterval(time, 1000);
//1st city() is run when submit is cricked
function city() {
getText(`http://api.openweathermap.org/data/2.5/weather?q=${cityname.value}&units=metric&appid=dd2148c708035bd9df9580495995612a`);
cityname.value = ""
document.querySelector(".center").style.display = "flex";
}
//2nd getText() is run to fetch openweather api
async function getText(file) {
let myObject = await fetch(file);
myText = await myObject.json();
populate(myText);
}
//3rd populate()- to display results
function populate(data) {
temp.innerHTML = `${myText.main.temp} C`;
loc.innerHTML = ` ${myText.name}, ${myText.sys.country}`;
min.innerHTML = `Min ${myText.main.temp_min} C`;
max.innerHTML = `Max ${myText.main.temp_max} C`;
weathdescr.innerHTML = myText.weather[0].description;
const icon = myText.weather[0].icon;
locationIcon.innerHTML = "<img src='http://openweathermap.org/img/wn/" + icon + "@4x.png'>"
background(myText.weather[0].description);
}
//4th background()- to add new background from unsplash api
function background(data) {
document.body.style.background =
"linear-gradient(rgba(255,255,255,.3), rgba(255,255,255,.3)),url("+`"https://source.unsplash.com/600x300/?${data}"`+")";
document.body.style.backgroundRepeat = "no-repeat";
document.body.style.backgroundSize = "100vw 100vh";
}