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什么是js特效遮罩层

时间：2021-07-01 10:21:17 帮助过：25人阅读

<!DOCTYPE html><html>
<head><meta charset="UTF-8"><title></title><style>* {
    margin: 0px;
    padding: 0px;
}
.mask {
    width: 100%;
    /*height: 500px;*/
    position: fixed;
    top: 0px;
    left: 0px;
    background-color: black;
    opacity: 0.5;
}
.show {
    width: 500px;
    height: 300px;
    position: fixed;
    top: 100px;
    left: 300px;
    background-color: white;
    z-index: 999;
}
</style></head>
<body><!--遮罩层--><p class="mask" hidden="hidden"></p><!--弹出层--><p class="show" hidden="hidden"></p><input type="button" value="点 出 来" onclick="show_plus()" /></body>
</html>
<script>var mask = document.getElementsByClassName('mask')[0];
    var show = document.getElementsByClassName("show")[0];
    var c_height = document.documentElement.clientHeight;
    var c_width = document.documentElement.clientWidth;
    mask.style.height = c_height + "px";
    show.style.left = c_width / 2 - 250 + "px";
    show.style.top = c_height / 2 - 150 + "px";
    function show_plus() {
    mask.removeAttribute("hidden");
    show.removeAttribute("hidden");
}
mask.onclick = function() {
    mask.setAttribute("hidden", "hidden");
    show.setAttribute("hidden", "hidden");
}
window.onresize = function() {
    var c_height = document.documentElement.clientHeight;
    var c_width = document.documentElement.clientWidth;
    mask.style.height = c_height + "px";
    show.style.left = c_width / 2 - 250 + "px";
    show.style.top = c_height / 2 - 150 + "px";
}
</script>

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什么是js特效遮罩层

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