一共有两个方案,一个是基于div和css的dom渲染,一个是基于canvas的硬件绘图文章来源地址https://www.toymoban.com/news/detail-714318.html
基于软件渲染原理的代码
class ColorRect extends HTMLElement
{
constructor()
{
super()
}
connectedCallback()
{
// 请修改参数
this.style.display = "inline-block"
this.style.backgroundColor = "blue"
this.style.width = "100px"
this.style.height = "80px"
}
}
customElements.define("color-rect",ColorRect)
<!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>ColorRect</title>
<script src="ColorRectComponent.js"></script>
</head>
<body>
<!-- 请在js进行方块大小和颜色的赋值 -->
<color-rect></color-rect>
</body>
</html>
基于canvas的代码
class ColorRect extends HTMLElement {
constructor() {
super();
this.canvas = document.createElement("canvas");
}
connectedCallback() {
this.appendChild(this.canvas);
// 设置canvas的样式和属性
this.canvas.style.display = "inline-block";
this.canvas.style.backgroundColor = "blue";
this.canvas.width = 100;
this.canvas.height = 80;
// 在canvas上绘制内容
const ctx = this.canvas.getContext("2d");
ctx.fillStyle = "black";
ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);
}
}
customElements.define("color-rect", ColorRect);
<!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>
<script src="ColorRectCanvasComponent.js"></script>
</head>
<body>
<color-rect></color-rect>
<!-- <canvas width="100px" height="50px"></canvas> -->
</body>
</html>
文章来源:https://www.toymoban.com/news/detail-714318.html
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