我已经玩了很长时间了,无法让 CSS 中的微调器在按下按钮时显示,然后在 JavaScript 函数执行后隐藏。这是我尝试用纯 JavaScript 做的一个片段。
<button id="spinBtn" onclick="spinIt()">Spin it</button>
<div class="spinner" style="visibility:hidden;">
<script>
function spinIt() {
document.getElementsByClassName("spinner").style.visibility = "visible";
setTimeout(function () {
// long code here
document.getElementsByClassName("spinner").style.visibility = "hidden";
}, 1); // give it a moment to redraw
}
</script>
最佳答案
尝试
使用 document.querySelectorAll
代替 document.getElementsByClassName
并增加 setTimeout 时间间隔。
和document.getElementsByClassName
返回匹配元素的数组。要选择第一个元素,请使用 document.getElementsByClassName('spinner')[0]
function spinIt() {
document.querySelectorAll(".spinner")[0].style.visibility = "visible";
setTimeout(function() {
// long code here
document.querySelectorAll(".spinner")[0].style.visibility = "hidden";
}, 1000); // give it a moment to redraw
}
.spinner {
margin: 100px auto;
width: 20px;
height: 20px;
position: relative;
}
.container1 > div,
.container2 > div,
.container3 > div {
width: 6px;
height: 6px;
background-color: #333;
border-radius: 100%;
position: absolute;
-webkit-animation: bouncedelay 1.2s infinite ease-in-out;
animation: bouncedelay 1.2s infinite ease-in-out;
/* Prevent first frame from flickering when animation starts */
-webkit-animation-fill-mode: both;
animation-fill-mode: both;
}
.spinner .spinner-container {
position: absolute;
width: 100%;
height: 100%;
}
.container2 {
-webkit-transform: rotateZ(45deg);
transform: rotateZ(45deg);
}
.container3 {
-webkit-transform: rotateZ(90deg);
transform: rotateZ(90deg);
}
.circle1 {
top: 0;
left: 0;
}
.circle2 {
top: 0;
right: 0;
}
.circle3 {
right: 0;
bottom: 0;
}
.circle4 {
left: 0;
bottom: 0;
}
.container2 .circle1 {
-webkit-animation-delay: -1.1s;
animation-delay: -1.1s;
}
.container3 .circle1 {
-webkit-animation-delay: -1.0s;
animation-delay: -1.0s;
}
.container1 .circle2 {
-webkit-animation-delay: -0.9s;
animation-delay: -0.9s;
}
.container2 .circle2 {
-webkit-animation-delay: -0.8s;
animation-delay: -0.8s;
}
.container3 .circle2 {
-webkit-animation-delay: -0.7s;
animation-delay: -0.7s;
}
.container1 .circle3 {
-webkit-animation-delay: -0.6s;
animation-delay: -0.6s;
}
.container2 .circle3 {
-webkit-animation-delay: -0.5s;
animation-delay: -0.5s;
}
.container3 .circle3 {
-webkit-animation-delay: -0.4s;
animation-delay: -0.4s;
}
.container1 .circle4 {
-webkit-animation-delay: -0.3s;
animation-delay: -0.3s;
}
.container2 .circle4 {
-webkit-animation-delay: -0.2s;
animation-delay: -0.2s;
}
.container3 .circle4 {
-webkit-animation-delay: -0.1s;
animation-delay: -0.1s;
}
@-webkit-keyframes bouncedelay {
0%, 80%, 100% {
-webkit-transform: scale(0.0)
}
40% {
-webkit-transform: scale(1.0)
}
}
@keyframes bouncedelay {
0%, 80%, 100% {
transform: scale(0.0);
-webkit-transform: scale(0.0);
}
40% {
transform: scale(1.0);
-webkit-transform: scale(1.0);
}
}
<p>
<button id="comboBtn" onclick="spinIt()">Combo it</button>
</p>
<div class="spinner" style="visibility:hidden">
<div class="spinner-container container1">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
<div class="spinner-container container2">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
<div class="spinner-container container3">
<div class="circle1"></div>
<div class="circle2"></div>
<div class="circle3"></div>
<div class="circle4"></div>
</div>
</div>
关于javascript - 如何在长时间执行 JavaScript 期间显示旋转器?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29278220/