HTML写圣诞树

而立终可得

已于 2022-12-24 21:27:06 修改

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CC 4.0 BY-SA版权

文章标签： html javascript 前端

于 2022-12-24 21:25:31 首次发布

原文链接：http://t.csdn.cn/30pZG

这个博客展示了一段使用HTML5 Canvas创建的动画代码，用于庆祝圣诞节。代码中包含JavaScript和Canvas API的使用，生成了一组动态的图形效果，包括彩色圆点和文字'Happy Christmas!'，为网页带来节日气氛。

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前言

提示：圣诞节到了，一行代码送给各位,直接复制粘贴即可

<!DOCTYPE  PUBLIC>
<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;
    }
  </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>
</canvas>
</body>
</html>