Question

我试图使用HTML5整理网站。我试图使用Javascript的canvas元素。我正在查看YouTube视频，我确定我正确地关注了所有内容，但我没有得到任何内容。有人可以查看代码，看看我是否遗漏了任何内容。

<html>
<head>

<script type=”text/javascript”>
    window.onload=loader;
    function loader()
    {
      var canvasI = document.getElementById("forcanvas");
      var canvasII = canvasI.getContext("2d");  
      canvasII.fillStyle ="rgba(0, 0, 200, 1)”;
      canvasII.fillRect(30, 30, 75, 70);
    }

</script>


</head>

<body>


<canvas id="forcanvas" width="500" height="500"></canvas>

</body>
</html>

Answer 1

替换”而不是"

试试这段代码：

<html>
<head>
<script type="text/javascript">
    window.onload=loader;
    function loader()
    {
      var canvasI = document.getElementById("forcanvas");
      var canvasII = canvasI.getContext("2d");  
      canvasII.fillStyle ="rgba(0, 0, 200, 1)";
      canvasII.fillRect(30, 30, 75, 70);
    }
</script>
</head>
<body>
<canvas id="forcanvas" width="500" height="500"></canvas>
</body>
</html>

在HTML5中使用canvas元素

1 个答案: