<style>
.add-1{
width: 100%;
height: 100%;
background-color: rgb(0 0 0 / 21%);
position: fixed;
top: 0;
bottom: 0;
left: 0;
right: 0;
}
</style>
<script>
function ade(){
document.getElementById('d4as').style.display="block";
}
</script>
</head>
<body>
<a href="javascript:ade()">点击我有遮罩层</a>
<div class="add-1" id="d4as" style="display: none;"></div>
</body>
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