The canvas tag is written anywhere on the HTML page, usually inside the "
" tag. Common usage methods: 1. Insert the Canvas tag directly into the HTML page; 2. Use JavaScript to dynamically create Canvas elements; 3. Use external JavaScript files to create Canvas elements. No matter where you place the Canvas tag in your HTML page, it is created when the browser loads and renders the page.
The operating system for this tutorial: Windows 10 system, DELL G3 computer.
The Canvas tag can be written anywhere on the HTML page, but is usually placed inside the
tag. The following are some common usages:Insert the Canvas tag directly into the HTML page:
<!DOCTYPE html>
<html>
<head>
<title>Canvas 示例</title>
</head>
<body>
<canvas id="myCanvas" width="500" height="500"></canvas>
</body>
</html>In this example, we inserted a id of "myCanvas" inside the
tag ” Canvas tag and specify the width and height.Use JavaScript to dynamically create a Canvas element:
<!DOCTYPE html>
<html>
<head>
<title>Canvas 示例</title>
<script>
window.onload = function() {
var canvas = document.createElement("canvas");
canvas.id = "myCanvas";
canvas.width = 500;
canvas.height = 500;
document.body.appendChild(canvas);
};
</script>
</head>
<body>
</body>
</html>In this example, we use JavaScript to dynamically create a Canvas element and set its properties. We then add it inside the
tag using the appendChild method.Use an external JavaScript file to create a Canvas element:
<!DOCTYPE html>
<html>
<head>
<title>Canvas 示例</title>
<script src="canvas.js"></script>
</head>
<body>
<canvas id="myCanvas" width="500" height="500"></canvas>
</body>
</html>In this example, we save the JavaScript code in an external file named "canvas.js" and use it in the HTML page <script> tag. The Canvas tag is then placed inside the <body> tag. </script>
No matter where you place the Canvas tag on an HTML page, it is created when the browser loads and renders the page. You can use JavaScript to manipulate the Canvas element and draw graphic animations or other visual effects within it.
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