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      CSS動(dòng)畫實(shí)例:升空的氣球

       悅光陰 2021-09-25

      1.制作一個(gè)氣球

            設(shè)頁(yè)面中有<div class="balloon"></div>,為. balloon設(shè)置樣式規(guī)則如下:

        .balloon

        {

          height: 96px;

          width: 80px;

          background: hsla(0, 100%, 50%, 0.8);

          border-radius: 50% 50% 50% 50% / 45% 45% 55% 55%;

          position: absolute;

          top: 30%;

          left:50%;

        }

        .balloon:before

        {

          content: '';

          position: absolute;

          width: 20%;

          height: 30%;

          top: 8%;

          left: 16%;

          border-radius: 50%;

          transform: rotate(40deg);

          background: hsla(0, 0%, 100%, 0.75);

        }

      可在頁(yè)面中顯示如圖1所示的圖形。

       

      圖1  氣球

            這個(gè)圖形像一個(gè)氣球,其中,樣式.balloon繪制大的紅色填充圓形,.balloon:before繪制里面的小圓形。再為這個(gè)氣球加上一個(gè)手把。在生成氣球形狀的div中加入一個(gè)子層,定義如下:

      <div class="balloon">

        <div class=" handle"></div>

      </div> 

      為. handle定義樣式規(guī)則如下:

        .handle

        {

          width: 2%;

          height: 60%;

          background:hsl(45, 100%, 40%);

          top: 100%;

          left: 50%;

          transform: translate(-50%, 0);

          position: absolute;

        }

        .handle:before,.handle:after

        {

          content: '';

          position: absolute;

          height: 5%;

          transform: translate(-50%, 0);

          border-radius: 25% / 50%;

          left: 50%;

        }

        .handle:before

        {

          top: 0;

          background:hsl(45, 100%, 40%);

          width: 500%;

        }

        .handle:after

        {

          top: 5%;

          background: hsla(0, 100%, 50%, 0.8);

          width: 700%;

        }

      此時(shí)可在頁(yè)面中顯示如圖2所示的圖形。

       

      圖2  帶手把的氣球

            為這個(gè)氣球定義關(guān)鍵幀,使得它進(jìn)行升空。編寫的完整的HTML文件如下。

      <!DOCTYPE html>
      <html>
      <head>
      <title>氣球升空</title>
      <style>
        .container
        {
          margin: 0 auto;
          width: 300px;
          height:300px;
          position: relative;
          display:flex;
          justify-content:center;
          align-items:center;
          background: #fff;
          overflow: hidden;
          border: 4px solid rgba(255, 0, 0, 0.9);
          border-radius: 2%;
        }
        .balloon 
        {
          height: 96px;
          width: 80px;
          background: hsla(0, 100%, 50%, 0.8);
          border-radius: 50% 50% 50% 50% / 45% 45% 55% 55%;
          position: absolute;
          top: 30%;
          left:50%;
           animation: float 5s infinite linear both;
        }
        .balloon:before 
        {
          content: '';
          position: absolute;
          width: 20%;
          height: 30%;
          top: 8%;
          left: 16%;
          border-radius: 50%;
          transform: rotate(40deg);
          background: hsla(0, 0%, 100%, 0.75);
        }
        .handle 
        {
          width: 2%;
          height: 60%;
          background:hsl(45, 100%, 40%);
          top: 100%;
          left: 50%;
          transform: translate(-50%, 0);
          position: absolute;
        }
        .handle:before,.handle:after 
        {
          content: '';
          position: absolute;
          height: 5%;
          transform: translate(-50%, 0);
          border-radius: 25% / 50%;
          left: 50%;
        }
        .handle:before 
        {
          top: 0;
          background:hsl(45, 100%, 40%);
          width: 500%;
        }
        .handle:after 
        {
          top: 5%;
          background: hsla(0, 100%, 50%, 0.8);
          width: 700%;
        }
        @keyframes float 
        {
           from  {  transform:  translate(0, 300px); }
           to      {  transform: translate(0, -300px); }
        }
      </style>
      </head>
      <body>
      <div  class="container">
      <div class="balloon">
        <div class="handle"></div>
      </div>  
      </div>    
      </body>
      </html>
      View Code

            在瀏覽器中打開包含這段HTML代碼的html文件,可以呈現(xiàn)出如圖1所示的動(dòng)畫效果。

       

      圖1  一個(gè)升空的氣球

      2.紅綠藍(lán)3個(gè)升空的氣球

            一個(gè)紅色氣球升空太孤單了,加兩個(gè)氣球(一個(gè)綠色、一個(gè)藍(lán)色)陪著升空。

            由生成氣球圖形的CSS定義可知,要生成不同顏色(用hsl函數(shù)表示顏色時(shí)的色相)、不同水平位置(升空總是從底部向上,垂直位置忽略好了)和不同大小的氣球,可以在<div class="balloon"></div>定義中加上style來描述反應(yīng)這三個(gè)特征的自定義變量—hue、--left和—size。然后適當(dāng)修改CSS樣式中與之相關(guān)的定義。

            直接給出完整的HTML文件內(nèi)容如下,讀者自己體會(huì)與1個(gè)氣球升空代碼的差別。

      <!DOCTYPE html>
      <html>
      <head>
      <title>氣球升空</title>
      <style>
        .container
        {
          margin: 0 auto;
          width: 300px;
          height:300px;
          position: relative;
          display:flex;
          justify-content:center;
          align-items:center;
          background: #fff;
          overflow: hidden;
          border: 4px solid rgba(255, 0, 0, 0.9);
          border-radius: 2%;
        }
        .balloon 
        {
          height: calc(1.2 * var(--size));
          width: var(--size);
          background: hsla(var(--hue), 100%, 50%, 0.8);
          border-radius: 50% 50% 50% 50% / 45% 45% 55% 55%;
          position: absolute;
          top: 30%;
          left:var(--left, 50%);
           animation: float 5s infinite linear both;
        }
        .balloon:before 
        {
          content: '';
          position: absolute;
          width: 20%;
          height: 30%;
          top: 8%;
          left: 16%;
          border-radius: 50%;
          transform: rotate(40deg);
          background: hsla(0, 0%, 100%, 0.75);
        }
        .handle 
        {
          width: 2%;
          height: 60%;
          background:hsl(45, 100%, 40%);
          top: 100%;
          left: 50%;
          transform: translate(-50%, 0);
          position: absolute;
        }
        .handle:before,.handle:after 
        {
          content: '';
          position: absolute;
          height: 5%;
          transform: translate(-50%, 0);
          border-radius: 25% / 50%;
          left: 50%;
        }
        .handle:before 
        {
          top: 0;
          background:hsl(45, 100%, 40%);
          width: 500%;
        }
        .handle:after 
        {
          top: 5%;
          background: hsla(var(--hue), 100%, 50%, 0.8)
          width: 700%;
        }
        @keyframes float 
        {
           from  {  transform: translate(-50%, -50%) translate(0, 300px); }
           to    {  transform: translate(-50%, -50%) translate(0, -300px); }
        }
      </style>
      </head>
      <body>
      <div  class="container">
      <div class="balloon" style="--left: 20%; --hue: 0; --size: 80px;">
        <div class="handle"></div>
      </div> 
      <div class="balloon" style="--left: 50%; --hue: 120; --size: 60px;">
        <div class="handle"></div>
      </div>  
      <div class="balloon" style="--left: 70%; --hue: 240; --size: 100px;">
        <div class="handle"></div>
      </div>    
      </div>    
      </body>
      </html>
      View Code

            在瀏覽器中打開包含這段HTML代碼的html文件,可以呈現(xiàn)出如圖2所示的動(dòng)畫效果。

       

      圖2  三個(gè)升空的氣球

      3.滿屏都是氣球在升空

            由圖2看出,三個(gè)升空的氣球速度相同,垂直方向位置也相同,能否讓它們有所不同呢?可以通過為氣球定義動(dòng)畫完成時(shí)間和延遲時(shí)間來實(shí)現(xiàn),再加上兩個(gè)自定義變量—rate和—delay。

            適當(dāng)修改.container的定義,使得呈現(xiàn)動(dòng)畫效果的容器大小與瀏覽器窗口大小相同。并定義多個(gè)氣球,編寫的HTML文件如下。

      <!DOCTYPE html>
      <html>
      <head>
      <title>氣球升空</title>
      <style>
        .container
        {
          margin: 0 auto;
          min-height:100vh;
          position: relative;
          display:flex;
          justify-content:center;
          align-items:center;
          background: hsl(180, 100%, 95%);
          overflow: hidden;
          border: 4px solid rgba(255, 0, 0, 0.9);
          border-radius: 2%;
        }
        .balloon 
        {
          --width: calc(var(--size, 10) * 1vmin);
          height: calc(1.2 * var(--width));
          width: var(--width);
          background: hsla(var(--hue), 100%, 50%, 0.8);
          border-radius: 50% 50% 50% 50% / 45% 45% 55% 55%;
          position: absolute;
          top: 30%;
          left:var(--left, 50%);
          animation: float calc(var(--rate, 1) * 1s) calc(var(--delay, 0) * -1s)  infinite linear both;
        }
        .balloon:before 
        {
          content: '';
          position: absolute;
          width: 20%;
          height: 30%;
          top: 8%;
          left: 16%;
          border-radius: 50%;
          transform: rotate(40deg);
          background: hsla(0, 0%, 100%, 0.75);
        }
        .handle 
        {
          width: 2%;
          height: 60%;
          background:hsl(45, 100%, 40%);
          top: 100%;
          left: 50%;
          transform: translate(-50%, 0);
          position: absolute;
        }
        .handle:before,.handle:after 
        {
          content: '';
          position: absolute;
          height: 5%;
          transform: translate(-50%, 0);
          border-radius: 25% / 50%;
          left: 50%;
        }
        .handle:before 
        {
          top: 0;
          background:hsl(45, 100%, 40%);
          width: 500%;
        }
        .handle:after 
        {
          top: 5%;
          background: hsla(var(--hue), 100%, 50%, 0.8)
          width: 700%;
        }
        @keyframes float 
        {
           from  {  transform: translate(-50%, -50%) translate(0, 100vh); }
           to    {  transform: translate(-50%, -50%) translate(0, -100vh); }
        }
      </style>
      </head>
      <body>
      <div  class="container">
      <div class="balloon" style="--left: 20%; --hue: 0; --size: 20;--rate: 1; --delay: 1;">
        <div class="handle"></div>
      </div> 
      <div class="balloon" style="--left: 50%; --hue: 120; --size: 15;--rate: 3; --delay: 3;">
        <div class="handle"></div>
      </div>  
      <div class="balloon" style="--left: 70%; --hue: 240; --size: 12;--rate: 5; --delay: 5;">
        <div class="handle"></div>
      </div>  
      <div class="balloon" style="--left: 35%; --hue: 0; --size: 18;--rate: 1; --delay: 1;">
        <div class="handle"></div>
      </div> 
      <div class="balloon" style="--left: 50%; --hue: 120; --size: 21;--rate: 3; --delay: 3;">
        <div class="handle"></div>
      </div>  
      <div class="balloon" style="--left: 89%; --hue: 240; --size: 22;--rate: 5; --delay: 5;">
        <div class="handle"></div>
      </div>  
      <div class="balloon" style="--left: 94%; --hue: 57; --size: 38; --rate: 3; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 90%; --hue: 124; --size: 36; --rate: 5; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 46%; --hue: 228; --size: 24; --rate: 7; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 59%; --hue: 196; --size: 20; --rate: 2; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 62%; --hue: 225; --size: 24; --rate: 9; --delay: 9;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 16%; --hue: 190; --size: 18; --rate: 4; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 67%; --hue: 105; --size: 28; --rate: 1; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 23%; --hue: 64; --size: 16; --rate: 2; --delay: 4;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 84%; --hue: 287; --size: 30; --rate: 1; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 87%; --hue: 191; --size: 34; --rate: 5; --delay: 0;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 77%; --hue: 313; --size: 24; --rate: 9; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 6%; --hue: 178; --size: 38; --rate: 7; --delay: 2;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 20%; --hue: 184; --size: 30; --rate: 7; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 24%; --hue: 79; --size: 18; --rate: 6; --delay: 2;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 78%; --hue: 167; --size: 20; --rate: 6; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 2%; --hue: 321; --size: 25; --rate: 2; --delay: 4;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 83%; --hue: 9; --size: 39; --rate: 5; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 10%; --hue: 257; --size: 49; --rate: 6; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 96%; --hue: 346; --size: 38; --rate: 7; --delay: 0;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 60%; --hue: 117; --size:33; --rate: 4; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 17%; --hue: 152; --size: 35; --rate: 9; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 57%; --hue: 286; --size: 31; --rate: 5; --delay: 4;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 73%; --hue: 116; --size: 15; --rate: 5; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 53%; --hue: 28; --size: 26; --rate: 1; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 83%; --hue: 198; --size: 35; --rate: 9; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 25%; --hue: 162; --size: 19; --rate: 6; --delay: 3;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 25%; --hue: 165; --size: 32; --rate: 1; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 99%; --hue: 153; --size: 17; --rate: 3; --delay: 4;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 58%; --hue: 111; --size: 27; --rate: 2; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 91%; --hue: 87; --size: 17; --rate: 9; --delay: 2;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 59%; --hue: 332; --size: 26; --rate: 9; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 71%; --hue: 291; --size: 32; --rate: 2; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 79%; --hue: 79; --size: 21; --rate: 9; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 29%; --hue: 278; --size: 24; --rate: 2; --delay: 0;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 91%; --hue: 193; --size: 40; --rate: 3; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 17%; --hue: 147; --size: 27; --rate: 6; --delay: 4;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 90%; --hue: 112; --size: 39; --rate: 4; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 33%; --hue: 179; --size: 26; --rate: 9; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 59%; --hue: 38; --size: 50; --rate: 6; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 49%; --hue: 92; --size: 24; --rate: 3; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 91%; --hue: 145; --size: 34; --rate: 1; --delay: 4;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 39%; --hue: 218; --size: 34; --rate: 3; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 99%; --hue: 245; --size: 36; --rate: 8; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 8%; --hue: 66; --size: 15; --rate: 6; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 83%; --hue: 51; --size: 27; --rate: 7; --delay: 8;">
        <div class="handle"></div>
      </div>
      
      <div class="balloon" style="--left: 71%; --hue: 81; --size: 27; --rate: 3; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 54%; --hue: 274; --size: 28; --rate: 1; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 25%; --hue: 70; --size: 15; --rate: 6; --delay: 2;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 99%; --hue: 282; --size: 27; --rate: 6; --delay: 4;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 17%; --hue: 312; --size: 27; --rate: 8; --delay: 3;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 30%; --hue: 157; --size: 27; --rate: 1; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 90%; --hue: 299; --size: 38; --rate: 6; --delay: 0;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 91%; --hue: 162; --size: 35; --rate: 5; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 50%; --hue: 213; --size: 19; --rate: 5; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 37%; --hue: 227; --size: 24; --rate: 7; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 61%; --hue: 182; --size: 31; --rate: 9; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 97%; --hue: 161; --size: 37; --rate: 1; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 5%; --hue: 113; --size: 21; --rate: 4; --delay: 4;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 48%; --hue: 17; --size: 37; --rate: 2; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 79%; --hue: 31; --size: 47; --rate: 9; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 53%; --hue: 54; --size: 22; --rate: 5; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 24%; --hue: 311; --size: 38; --rate: 9; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 89%; --hue: 48; --size: 17; --rate: 4; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 65%; --hue: 97; --size: 31; --rate: 3; --delay: 8;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 57%; --hue: 9; --size: 17; --rate: 6; --delay: 0;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 9%; --hue: 14; --size: 36; --rate: 4; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 96%; --hue: 100; --size: 24; --rate: 8; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 14%; --hue: 228; --size: 25; --rate: 7; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 90%; --hue: 216; --size: 32; --rate: 7; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 92%; --hue: 220; --size: 24; --rate: 5; --delay: 3;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 72%; --hue: 276; --size: 18; --rate: 8; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 43%; --hue: 26; --size: 28; --rate: 4; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 68%; --hue: 97; --size: 37; --rate: 5; --delay: 0;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 40%; --hue: 119; --size: 20; --rate: 6; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 20%; --hue: 338; --size: 37; --rate: 6; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 55%; --hue: 336; --size: 36; --rate: 2; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 81%; --hue: 10; --size: 17; --rate: 2; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 69%; --hue: 314; --size: 20; --rate: 10; --delay: 1;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 59%; --hue: 169; --size: 22; --rate: 7; --delay: 10;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 93%; --hue: 165; --size: 38; --rate: 7; --delay: 2;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 7%; --hue: 271; --size: 33; --rate: 1; --delay: 3;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 21%; --hue: 349; --size: 36; --rate: 8; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 13%; --hue: 38; --size: 35; --rate: 2; --delay: 9;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 55%; --hue: 164; --size: 27; --rate: 9; --delay: 7;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 70%; --hue: 66; --size: 37; --rate: 5; --delay: 0;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 5%; --hue: 264; --size: 15; --rate: 4; --delay: 9;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 24%; --hue: 265; --size: 40; --rate: 7; --delay: 6;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 11%; --hue: 101; --size: 26; --rate: 4; --delay: 5;">
        <div class="handle"></div>
      </div>
      <div class="balloon" style="--left: 25%; --hue: 207; --size: 40; --rate: 3; --delay: 0;">
        <div class="handle"></div>
      </div>
      </div>    
      </body>
      </html>
      View Code

            在瀏覽器中打開包含這段HTML代碼的html文件,可以呈現(xiàn)出如圖3所示的動(dòng)畫效果。

       

      圖3  滿屏升空的氣球

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