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HTML

              
                <head>
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <!--==============レイアウトを制御する独自のCSSを読み込み===============-->
  <link href="https://assets.codepen.io/6329135/reset04.css" rel="stylesheet">
</head>

<body>
  <div id="wrapper">
    <div class="wave">
      <p>コンテンツが入ります。</p>
      <canvas id="waveCanvas"></canvas>
    </div>
    <div class="wave">
      <p>コンテンツが入ります。</p>
      <canvas id="waveCanvas2"></canvas>
    </div>
    <div class="wave">
      <p>コンテンツが入ります。</p>
      <canvas id="waveCanvas3"></canvas>
    </div>
    <p>※参照 <a href="https://jsfiddle.net/39we73t1/" target="_blank">https://jsfiddle.net/39we73t1/</a></p>
    <!--/wrapper-->
  </div>
</body>
              
            
!

CSS

              
                @charset "utf-8";

/*========= レイアウトのためのCSS ===============*/

#wrapper p {
  padding: 40px 0;
  text-align: center;
}

/*========= waveを描画するエリア設定 ===============*/

.wave {
  position: relative;
}

.wave canvas {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
}

              
            
!

JS

              
                var unit = 100,
  canvasList, // キャンバスの配列
  info = {}, // 全キャンバス共通の描画情報
  colorList; // 各キャンバスの色情報

/**
 * Init function.
 *
 * Initialize variables and begin the animation.
 */
function init() {
  info.seconds = 0;
  info.t = 0;
  canvasList = [];
  colorList = [];
  // canvas1個めの色指定
  canvasList.push(document.getElementById("waveCanvas"));
  colorList.push(["#0ff", "#ff0", "#f00", "#00f", "#f0f"]); //重ねる波線の色設定

  // canvas2個めの色指定
  canvasList.push(document.getElementById("waveCanvas2"));
  colorList.push(["#43c0e4"]);

  // canvas3個めの色指定
  canvasList.push(document.getElementById("waveCanvas3"));
  colorList.push(["#666", "#888"]);

  // 各キャンバスの初期化
  for (var canvasIndex in canvasList) {
    var canvas = canvasList[canvasIndex];
    canvas.width = document.documentElement.clientWidth; //Canvasのwidthをウィンドウの幅に合わせる
    canvas.height = 100; //波の高さ
    canvas.contextCache = canvas.getContext("2d");
  }
  // 共通の更新処理呼び出し
  update();
}

function update() {
  for (var canvasIndex in canvasList) {
    var canvas = canvasList[canvasIndex];
    // 各キャンバスの描画
    draw(canvas, colorList[canvasIndex]);
  }
  // 共通の描画情報の更新
  info.seconds = info.seconds + 0.014;
  info.t = info.seconds * Math.PI;
  // 自身の再起呼び出し
  setTimeout(update, 35);
}

/**
 * Draw animation function.
 *
 * This function draws one frame of the animation, waits 20ms, and then calls
 * itself again.
 */
function draw(canvas, color) {
  // 対象のcanvasのコンテキストを取得
  var context = canvas.contextCache;
  // キャンバスの描画をクリア
  context.clearRect(0, 0, canvas.width, canvas.height);

  //波を描画 drawWave(canvas, color[数字(波の数を0から数えて指定)], 透過, 波の幅のzoom,波の開始位置の遅れ )
  drawWave(canvas, color[0], 0.8, 3, 0);
  drawWave(canvas, color[1], 0.5, 4, 0);
  drawWave(canvas, color[2], 0.3, 1.6, 0);
  drawWave(canvas, color[3], 0.2, 3, 100);
  drawWave(canvas, color[4], 0.8, 2, 0);
}

/**
 * 波を描画
 * drawWave(色, 不透明度, 波の幅のzoom, 波の開始位置の遅れ)
 */
function drawWave(canvas, color, alpha, zoom, delay) {
  var context = canvas.contextCache;
  context.strokeStyle = color; //線の色
  context.lineWidth = 1; //線の幅
  context.globalAlpha = alpha;
  context.beginPath(); //パスの開始
  drawSine(canvas, info.t / 0.5, zoom, delay);
  context.stroke(); //線
}

/**
 * Function to draw sine
 *
 * The sine curve is drawn in 10px segments starting at the origin.
 * drawSine(時間, 波の幅のzoom, 波の開始位置の遅れ)
 */
function drawSine(canvas, t, zoom, delay) {
  var xAxis = Math.floor(canvas.height / 2);
  var yAxis = 0;
  var context = canvas.contextCache;
  // Set the initial x and y, starting at 0,0 and translating to the origin on
  // the canvas.
  var x = t; //時間を横の位置とする
  var y = Math.sin(x) / zoom;
  context.moveTo(yAxis, unit * y + xAxis); //スタート位置にパスを置く

  // Loop to draw segments (横幅の分、波を描画)
  for (i = yAxis; i <= canvas.width + 10; i += 10) {
    x = t + (-yAxis + i) / unit / zoom;
    y = Math.sin(x - delay) / 3;
    context.lineTo(i, unit * y + xAxis);
  }
}

init();

              
            
!
999px

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