返回到：Canvas API：CanvasRenderingContext2D
CanvasRenderingContext2D.shadowBlur 是 Canvas 2D API 描述模糊效果程度的属性；它既不对应像素值也不受当前转换矩阵的影响。默认值是 0。
语法
ctx.shadowBlur = level;level
描述模糊效果程度的，float 类型的值。默认值是 0。负数、 Infinity 或者 NaN 都会被忽略。
示例
使用 shadowBlur 属性
这是一段简单的代码片段，使用 shadowblur 属性设置模糊阴影。 注意：只有设置 shadowColor 属性值为不透明，阴影才会被绘制。
HTML
<canvas id="canvas"></canvas>JavaScript
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.shadowColor = "black";
ctx.shadowBlur = 10;
ctx.fillStyle = "white";
ctx.fillRect(10, 10, 100, 100);修改下面的代码并在线查看 canvas 的变化：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="robots" content="noindex, nofollow">
<style>
body {
padding: 0;
margin: 0;
}
svg:not(:root) {
display: block;
}
.playable-code {
background-color: #f4f7f8;
border: none;
border-left: 6px solid #558abb;
border-width: medium medium medium 6px;
color: #4d4e53;
height: 100px;
width: 90%;
padding: 10px 10px 0;
}
.playable-canvas {
border: 1px solid #4d4e53;
border-radius: 2px;
}
.playable-buttons {
text-align: right;
width: 90%;
padding: 5px 10px 5px 26px;
}
</style>
<title>CanvasRenderingContext2D.shadowBlur | Web176教程www.web176.com</title>
</head>
<body>
<canvas id="canvas" width="400" height="200" class="playable-canvas"></canvas>
<div class="playable-buttons">
<input id="edit" type="button" value="Edit" />
<input id="reset" type="button" value="Reset" />
</div>
<textarea id="code" class="playable-code">
ctx.shadowColor = "black";
ctx.shadowBlur = 10;
ctx.fillStyle = "white";
ctx.fillRect(10, 10, 100, 100);</textarea>
<script>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
ctx.shadowColor = "black";
ctx.shadowBlur = 10;
ctx.fillStyle = "white";
ctx.fillRect(10, 10, 100, 100);
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var textarea = document.getElementById("code");
var reset = document.getElementById("reset");
var edit = document.getElementById("edit");
var code = textarea.value;
function drawCanvas() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
eval(textarea.value);
}
reset.addEventListener("click", function() {
textarea.value = code;
drawCanvas();
});
edit.addEventListener("click", function() {
textarea.focus();
})
textarea.addEventListener("input", drawCanvas);
window.addEventListener("load", drawCanvas);
</script>
</body>
</html>返回到：Canvas API：CanvasRenderingContext2D
作者：terry，如若转载，请注明出处：https://www.web176.com/canvas_api/7995.html
