首先建立HTML
<div class="shaded" id="shaded">
<div class="spinner">
<div class="spinneritem1"></div>
<div class="spinneritem2"></div>
<div class="spinneritem3"></div>
<div class="spinneritem4"></div>
<div class="spinneritem5"></div>
</div>
</div>
Css代碼如下，遮罩效果如下className為shaded:
.shaded{
opacity: .5;
position: fixed;
top: 0;
right: 0;
bottom: 0;
left: 0;
z-index: 1030;
background-color: #000;
display: none;
}
.spinner {
margin: 100px auto;
width: 150px;
height: 80px;
text-align: center;
font-size: 17px;
position: fixed;
z-index: 9999;
opacity: 1;
bottom: 40%;
right: 46%;
}
.spinner > div {
background-color: #8d8d8d;
height: 100%;
width: 15px;
display: inline-block;
-webkit-animation: stretchdelay 1.2s infinite ease-in-out;
animation: stretchdelay 1.2s infinite ease-in-out;
border-radius: 15%;
}
.spinner .spinneritem2 {
-webkit-animation-delay: -1.1s;
animation-delay: -1.1s;
}
.spinner .spinneritem3 {
-webkit-animation-delay: -1.0s;
animation-delay: -1.0s;
}
.spinner .spinneritem4 {
-webkit-animation-delay: -0.9s;
animation-delay: -0.9s;
}
.spinner .spinneritem5 {
-webkit-animation-delay: -0.8s;
animation-delay: -0.8s;
}
@-webkit-keyframes stretchdelay {
0%, 40%, 100% {
-webkit-transform: scaleY(0.4)
}
20% {
-webkit-transform: scaleY(1.0)
}}
@keyframes stretchdelay {
0%, 40%, 100% {
transform: scaleY(0.4);
-webkit-transform: scaleY(0.4);
}
20% {
transform: scaleY(1.0);
-webkit-transform: scaleY(1.0);
}
}
JavaScript代碼如下，使用 fadeout 讓遮屏消失大部分使用opacity去做設定:
function shadeout() {
let op = 1;
let element = document.getElementById("shaded");
// 設定 opacity
let timer = setInterval(function () {
if (op <= 0.1) {
clearInterval(timer);
element.style.display = 'none';
}
element.style.opacity = op;
element.style.filter = 'alpha(opacity=' + op * 100 + ")";
op -= op * 0.1;
}, 50);};
//使用 fadein 讓遮屏出現
function shadein() {
let op = 0.1;
//設定 opacity
document.getElementById("shaded").setAttribute("style", "display:block");
let element = document.getElementById("shaded");
let timer = setInterval(function () {
if (op > 0.5) {
clearInterval(timer);
}
element.style.opacity = op;
element.style.filter = 'alpha(opacity=' + op * 100 + ")";
op += op * 0.5;
}, 10);
};
REFERENCE / 3