Canvas的使用

你的名字 2022-08-28 07:53 63阅读 0赞

<!DOCTYPE html>
    <html lang="en">
      <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
        <style>
          canvas {
            width: 200px;
            height: 200px;
            background-color: yellow;
          }
        </style>
        <script>
          window.onload = function () {
            var c = document.getElementById("myCanvas");
            // console.log("haha");
            var ctx = c.getContext("2d");
            var gradient = ctx.createLinearGradient(30, 30, 70, 70); //发生渐变的区域  这里指的就是绘制渐变的线条
            gradient.addColorStop(0, "white");
            gradient.addColorStop(1, "black");
            // 填充渐变
            ctx.fillStyle = gradient;
            ctx.fillRect(10, 10, 150, 80); //黑和白填充的区域范围
    
            var c2 = document.getElementById("myCanvas2");
            var ctx2 = c2.getContext("2d");
            ctx2.fillStyle = "red";
            ctx2.fillRect(10, 10, 150, 80);
          };
        </script>
      </head>
      <body>
        <canvas id="myCanvas"></canvas>
        <canvas id="myCanvas2"></canvas>
      </body>
    </html>