<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Canvas画布</title>
</head>
<body>
<h1>Canvas画布</h1>
<canvas id="myCanvas"></canvas>
</body>
</html>
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var c = document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var my_gradient=ctx.createLinearGradient(0,0,150,100);
my_gradient.addColorStop(0,"black");
my_gradient.addColorStop(0.2,"blue");
my_gradient.addColorStop(0.5,"red");
my_gradient.addColorStop(0.7,"yellow");
my_gradient.addColorStop(0.9,"gray");
my_gradient.addColorStop(1,"white");
ctx.fillStyle=my_gradient;
ctx.shadowBlur=20;
ctx.shadowColor="black";
ctx.fillRect(0,0,150,75);
输入 CSS 代码……