在一个html文件中运行以下代码

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>
        From ZXW-NUDT
    </title>
    <style>
        body {
            text-align: center;
        }

        html, body {
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            border: 0;
        }

        div {
            margin: 0;
            padding: 0;
            border: 0;
        }

        .nav {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 27px;
            background-color: white;
            color: black;
            text-align: center;
            line-height: 25px;
        }

        a {
            color: black;
            text-decoration: none;
            border-bottom: 1px dashed black;
        }

        a:hover {
            border-bottom: 1px solid red;
        }

        .previous {
            float: left;
            margin-left: 10px;
        }

        .next {
            float: right;
            margin-right: 10px;
        }

        .green {
            color: green;
        }

        .red {
            color: red;
        }

        textarea {
            width: 100%;
            height: 100%;
            border: 0;
            padding: 0;
            margin: 0;
            padding-bottom: 20px;
        }

        .block-outer {
            float: left;
            width: 22%;
            height: 100%;
            padding: 5px;
            border-left: 1px solid black;
            margin: 30px 3px 3px 3px;
        }

        .block-inner {
            height: 68%;
        }

        .one {
            border: 0;
        }
        .canvas{
            width: 50%;
            height: 100%;
        }
    </style>
</head>
<body marginwidth="0" marginheight="0">
<canvas id="c" height="356" width="446">
    <script>
        var collapsed = true;

        function toggle() {
            var fs = top.document.getElementsByTagName('frameset')[0];
            var f = fs.getElementsByTagName('frame');
            if (collapsed) {
                fs.rows = '250px,*';
                fs.noResize = false;
                f[0].noResize = false;
                f[1].noResize = false;
            } else {
                fs.rows = '30px,*';
                fs.noResize = true;
                f[0].noResize = true;
                f[1].noResize = true;
            }
            collapsed = !collapsed;
        }
    </script>

    <script>
        var b = document.body;
        var c = document.getElementsByTagName('canvas')[0];
        var a = c.getContext('2d');
        document.body.clientWidth;
    </script>

    <script>
        M = Math;
        Q = M.random;
        J = [];
        U = 16;
        T = M.sin;
        E = M.sqrt;
        for (O = k = 0; x = z = j = i = k < 200;)
            with (M[k] = k ? c.cloneNode(0) : c) {
                width = height = k ? 32 : W = 446;
                with (getContext('2d'))
                    if (k > 10 | !k)

                        for (
                            font = '60px Impact',
                                V = 'rgba('; I = i * U, fillStyle = k ? k == 13 ? V + '205,205,215,.15)' :
                            V + (147 + I) + ',' + (k % 2 ? 128 + I : 0) + ',' + I + ',.5)' : '#cca', i < 7;)

                            beginPath(fill(arc(U - i / 3, 24 - i / 2, k == 13 ? 4 - (i++) / 2 : 8 - i++, 0, M.PI * 2, 1)));

                    else for (;
                        x = T(i),
                            y = Q() * 2 - 1,
                            D = x * x + y * y,
                            B = E(D - x / .9 - 1.5 * y + 1),
                            R = 67 * (B + 1) * (L = k / 9 + .8) >> 1,
                        i++ < W;
                    )

                        if (D < 1)
                            beginPath(strokeStyle = V + R + ',' + (R + B * L >> 0) + ',40,.1)'),
                                moveTo(U + x * 8, U + y * 8),
                                lineTo(U + x * U, U + y * U),
                                stroke();

                for (
                    y = H = k + E(k++) * 25,
                        R = Q() * W;
                    P = 3, j < H;)
                    J[O++] = [
                        x += T(R) * P + Q() * 6 - 3, y += Q() * U - 8,
                        z += T(R - 11) * P + Q() * 6 - 3,
                        j / H * 20 + ((j += U) > H & Q() > .8 ? Q(P = 9) * 4 : 0) >> 1]
            }

        setInterval(function G(m, l) {
            A = T(D - 11);
            if (l)

                return (
                    m[2] - l[2]) * A + (l[0] - m[0]) * T(D);
            a.clearRect(0, 0, W, W);
            J.sort(G);

            for (
                i = 0;
                L = J[i++];
                a.drawImage(M[L[3] + 1], 207 + L[0] * A + L[2] * T(D) >> 0, L[1] >> 1)) {
                if (i == 2e3)
                    a.fillText
                    ('Happy Christmas!', U, 345);

                if (!(i % 7))
                    a.drawImage(M[13],
                        ((157 * (i * i) + T(D * 5 + i * i) * 5) % W) >> 0,
                        ((113 * i + (D * i) / 60) % (290 + i / 99)) >> 0);
            }
            D += .02
        }, 1)
    </script>
</body>
</html>

运行效果

                         

                                                                                            圣诞快乐 ！

# html # css # javascript
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