我正在尝试使文本淡出1000毫秒,等待1000毫秒,将文本更改为数组中的随机条目,然后淡入1000毫秒。文本应淡入淡出地呆在那里5秒钟。
我已经设法更改了文本,但是还没有找到如何使其淡入和淡出的方法。以下是我的网站示例:
HTML / JS:
<html>
<head>
<script src = "https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
</head>
<body>
<h1 id = "Welcome"></h1>
</body>
<footer>
<script type = "text/javascript">
//Default greetings
var welcomeList = ["WELCOME", "BIENVENUE", "BIENVENIDO", "HELLO", "SALUT", "HOLA", "BONJOUR"];
//Get random greeting
var welcomeText = welcomeList[Math.floor(Math.random() * welcomeList.length)];
//Add greeting before first change
document.getElementById("Welcome").innerHTML = welcomeText;
var welcomeInterval = setInterval(changeText, 5000);
var FadeOutInterval = setInterval(fadeout, 4000);
var FadeInInterval = setInterval(fadein, 5000);
function changeText() {
welcomeText = welcomeList[Math.floor(Math.random() * welcomeList.length)];
document.getElementById("Welcome").innerHTML = welcomeText;
}
function fadeout() {
$("#Welcome").fadeOut(1000)
}
function fadein() {
$("#Welcome").fadeIn(1000)
}
</script>
</footer>
</html>
文本可以更改,但不会淡入或淡出。我将如何使它淡入淡出?任何帮助将不胜感激。
答案 0 :(得分:2)
这是我认为的最佳实践,因为它使用回调实际上要等到确认动画完成后再继续:
//Default greetings
var welcomeList = ["WELCOME", "BIENVENUE", "BIENVENIDO", "HELLO", "SALUT", "HOLA", "BONJOUR"];
//Add greeting before first change
$("#Welcome").text(rando(welcomeList).value);
var SHOWN_TIME = 5000;
var HIDDEN_TIME = 1000;
var FADING_OUT_TIME = 1000;
var FADING_IN_TIME = 1000;
function changeText() {
$("#Welcome").fadeOut(FADING_OUT_TIME, function() {
setTimeout(function() {
document.getElementById("Welcome").innerHTML = rando(welcomeList).value;
$("#Welcome").fadeIn(FADING_IN_TIME, function() {
setTimeout(changeText, SHOWN_TIME);
});
}, HIDDEN_TIME);
});
}
setTimeout(changeText, SHOWN_TIME);
<script src="https://randojs.com/1.0.0.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<h1 id="Welcome"></h1>
这是一个较短的版本,但它不使用回调来确保在继续之前(尽管应该如此)最后一次迭代已完成:
//Default greetings
var welcomeList = ["WELCOME", "BIENVENUE", "BIENVENIDO", "HELLO", "SALUT", "HOLA", "BONJOUR"];
//Add greeting before first change
$("#Welcome").text(rando(welcomeList).value);
setTimeout(function() {
animateChange();
setInterval(animateChange, 8000);
}, 5000);
function animateChange() {
$("#Welcome").fadeOut(1000, function() { $("#Welcome").text(rando(welcomeList).value); }).delay(1000).fadeIn(1000);
}
<script src="https://randojs.com/1.0.0.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<h1 id="Welcome"></h1>
在两种情况下,我都使用randojs.com使随机性更具可读性,因此,如果您喜欢此答案,请确保包括以下内容:
<script src="https://randojs.com/1.0.0.js"></script>