前台页面添加加载中

从别的地方找的

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        .loadingBody{
            position: relative;
        }
        .loadingBody:before{
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 9999;
            background: rgba(0, 0, 0, 0.5);
        }

        .loadingBody:after {
            content: "";
            width: 45px;
            height: 45px;
            display: block;
            position: absolute;
            z-index: 99999;
            top: calc((100% - 45px) * 0.5);
            left: calc((100% - 45px) * 0.5);
            border-radius: 50%;

            border-top: 1px solid #fff;
            border-right: 1px solid transparent;
            border-bottom: 1px solid #fff;
            border-left: 1px solid #fff;
            animation: loadingAnimate 0.8s linear infinite;
        }

        @keyframes loadingAnimate {
            0% {
                transform: rotate(0deg);
            }

            50% {
                transform: rotate(180deg);
            }

            100% {
                transform: rotate(360deg);
            }
        }
    </style>
</head>
<body>
<div id="loadingBody" style="width: 200px;height: 200px;"></div>
<script>
    loading(true)
    // loading
    function loading(status) {
        const loadingBody = document.getElementById('loadingBody')
        if (status) {
            loadingBody.classList.add('loadingBody')
        } else {
            loadingBody.classList.remove('loadingBody')
        }
    }
</script>
</body>
</html>

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