canvas宽高问题，已解决

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问

js 设置 canvas 宽高为浏览器可用宽高，滚动条仍然出现，如下代码

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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>CANVAS</title>
  <style>
    * {
      padding: 0;
      margin: 0;
    }
    html,
    body {
      height: 100%;
    }
    #canvas {
      background-color: #cba;
    }
  </style>
</head>
<body>
  <canvas id="canvas"></canvas>
  <script>
    var canvas = document.getElementById('canvas');
    canvas.width = document.body.clientWidth;
    // canvas.width = window.innerWeight;
    canvas.height = document.body.clientHeight;
    // canvas.height = window.innerHeight;
    context = canvas.getContext('2d');
    context.beginPath();
    context.arc(100, 100, 50, 0, 1.5 * Math.PI, true);
    context.closePath();
    context.strokeStyle = '#f0f';
    context.stroke();
  </script>
</body>
</html>

答

用一元素包裹一下即可

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<!DOCTYPE html>
<html>
<head>
  <title></title>
  <style type="text/css">
    * {
      margin: 0;
      padding: 0;
    }
    .canvas-box {
      /* IE兼容问题 */
      /* display: flex; */
      font-size: 0;
    }
    canvas {
      background-color: #fcf;
    }
  </style>
</head>
<body>
  <div class="canvas-box">
    <canvas></canvas>
  </div>
  <script>
    var canvas = document.querySelector('canvas');
    canvas.width = window.innerWidth;
    canvas.height = window.innerHeight;
  </script>
</body>
</html>
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