css3 mask遮罩實現一些特效
摘要：
遮罩mask的功能就是使用透明的圖片或漸變遮罩元素的背景。於是，遮罩mask與背景background非常類似，除了沒有color子屬性，背景background剩下的6個子屬性，mask都有 遮罩mask是一個複合屬性，包括mask-image、mask-mode、mask-repeat、...
遮罩mask的功能就是使用透明的圖片或漸變遮罩元素的背景。於是，遮罩mask與背景background非常類似，除了沒有color子屬性，背景background剩下的6個子屬性，mask都有 遮罩mask是一個複合屬性，包括mask-image、mask-mode、mask-repeat、mask-position、mask-clip、mask-origin、mask-size、mask-composite這8個屬性 注意: IE瀏覽器不支援，webkit核心的瀏覽器(包括chrome、safari、IOS、android)需要新增-webkit-字首。要特別注意的是，firefox瀏覽器也支援webkit-mask屬性
【mask-image】
預設值為none，值為透明圖片，或透明漸變
【mask-repeat】
預設值為repeat，可選值與background-repeat相同，詳細情況移步至此
【mask-position】
預設值為0 0，可選值與background-position相同，詳細情況移步至此
【mask-clip】
預設值為border-box，可選值與background-clip相同，詳細情況移步至此
【mask-origin】
預設值為border-box，可選值與background-origin相同，詳細情況移步至此
【mask-size】
預設值為auto，可選值與background-size相同，詳細情況移步至此
【mask-mode】
預設值為match-source，可選值為alpha、luminance、match-source，或者它們的組合
【mask-composite】
預設值為add，可選值為add、subtract、intersect、exclude
[注意]只有firefox支援mask-mode和mask-composite
一，高斯模糊+mask遮罩
原始碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
* {
padding: 0;
margin: 0;
}
html,
body {
height: 100vh;
width: 100vw;
}
body {
display: flex;
justify-content: center;
align-items: center;
flex-direction: column;
font-family: "Open Sans","PingFang SC","Microsoft YaHei","Helvetica Neue","Hiragino Sans GB","WenQuanYi Micro Hei",Arial,sans-serif;
}
@keyframes move {
0% {
background-position: 0 0;
}
50% {
background-position: 100% 0;
}
}
.bg {
background: url(https://sp-webfront.skypixel.com/skypixel/v2/public/website/assets/1535027674204-f6eca6369ec03e70262b58b0e25cda7b.jpg);
background-size: cover;
position: fixed;
top: -20px;
left: -20px;
right: -20px;
bottom: -20px;
filter: blur(15px);
z-index: -1;
}
.mask {
width: 340px;
height: 196px;
animation: move 40s infinite;
background-image: url(https://sp-webfront.skypixel.com/skypixel/v2/public/website/assets/1535027674204-f6eca6369ec03e70262b58b0e25cda7b.jpg);
background-size: cover;
-webkit-mask:
url(http://static.w3ctrain.com/upload_cae6fcb079f57792a47202cb67bbc04a-dji-seeklogo.com.svg);
-webkit-mask-size: cover;
}
</style>
</head>
<body>
<div class="bg"></div>
<div class="mask"></div>
</body>
</html>
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二，窺見一點
原始碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.wrap{
position:absolute;
width: 400px;
border:1px solid black;
}
#mask{
height: 300px;
background:url(http://sandbox.runjs.cn/uploads/rs/142/wat3wtnz/dongzhi.jpg) lightblue;
-webkit-mask:url(http://sandbox.runjs.cn/uploads/rs/142/wat3wtnz/mask.png) no-repeat;
animation: 2s maskPosition infinite alternate ;
}
#mask:hover{
animation: none;
}
@keyframes maskPosition{
0%{-webkit-mask-position:0 0;}
100%{-webkit-mask-position:100% 100%;}
}
</style>
</head>
<body>
<div class="wrap">
<div id="mask"></div>
</div>
<script>
var oBox = document.getElementById('mask');
oBox.onmousemove = function(e){
e = e || event;
oBox.style.WebkitMaskPosition=(e.clientX-50)+"px "+ (e.clientY-50)+"px";
}
</script>
</body>
</html>
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三，鏤空效果
原始碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
* {
box-sizing: border-box;
padding: 0;
margin: 0;
}
body {
background-image: linear-gradient(-45deg, #8067B7, #EC87C0);
min-height: calc(100vh - 40px);
margin: 20px;
font-family: 'Lato', sans-serif;
display: flex;
justify-content: center;
align-items: center;
}
.wrapper {
display: flex;
flex-direction: column;
align-items: center;
}
.mask {
width: 288px;
height: 176px;
background: url(http://static.w3ctrain.com/upload_dc601fca016e97ec2575565e7f0dcfb2-mask2.svg);
background-size: cover;
}
.ticket-mask {
width: 288px;
height: 176px;
-webkit-mask:
url(http://static.w3ctrain.com/upload_dc601fca016e97ec2575565e7f0dcfb2-mask2.svg);
mask-size: cover;
}
.ticket {
width: 288px;
height: 176px;
border-radius: 4px;
overflow: hidden;
background-image: linear-gradient(134deg, #3023AE 0%, #C86DD7 100%);
}
.info {
height: 120px;
background: url(http://static.w3ctrain.com/upload_9c0746a7eb377f304e733edc1effdb40-cover.jpeg);
padding: 24px 16px;
color: white;
}
h3 {
font-size: 24px;
line-height: 32px;
}
p {
margin: 16px 0 0 0;
}
button {
background: transparent;
appearance: none;
display: flex;
border: none;
height: 56px;
justify-content: center;
align-items: center;
width: 100%;
font-size: 14px;
color: white;
outline: none;
}
.symbol {
color: white;
font-size: 64px;
margin: 16px 40px;
}
.addend {
display: flex;
align-items: center;
}
@media (max-width: 800px) {
flex-direction: column
;
}
</style>
</head>
<body>
<div class="wrapper">
<div class="addend">
<div class="ticket">
<div class="info">
<h3>打骨折</h3>
<p>專治各種不服</p>
</div>
<button>
買買買
</button>
</div>
<span class="symbol">+</span>
<div class="mask"></div>
</div>
<span class="symbol">=</span>
<div class="ticket-mask">
<div class="ticket">
<div class="info">
<h3>打骨折</h3>
<p>專治各種不服</p>
</div>
<button>
買買買
</button>
</div>
</div>
</div>
</body>
</html>
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