sidebar:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvas_CanvasContext-setGlobalAlpha

title:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ CanvasContext.setGlobalAlpha header:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ develop nav:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ api

sidebar:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvas_CanvasContext-setGlobalAlpha

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 解释：设置全局画笔透明度。

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 方法参数

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ Number/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ alpha：/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 透明度取值范围：/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 0~1/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ ，0/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 表示完全透明，1/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 表示完全不透明。/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 示例

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 扫码体验

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 请使用百度APP扫码

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 图片示例/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

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/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

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/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 代码示例1/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ ：

在开发者工具中预览效果

:::codeTab

const/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvasContext/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ =/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ swan.createCanvasContext('myCanvas');
canvasContext.setFillStyle('red');
canvasContext.fillRect(10,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 10,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 150,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 100);
canvasContext.setGlobalAlpha(0.2);
canvasContext.setFillStyle('blue');
canvasContext.fillRect(50,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 50,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 150,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 100);
canvasContext.setFillStyle('yellow');
canvasContext.fillRect(100,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 100,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 150,/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 100);
canvasContext.draw();

:::

/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 代码示例2/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ -/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ 同时设置多个透明度，透明度高的图形显示会高于透明度低的图形/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ ：

在开发者工具中预览效果

:::codeTab

Page({
/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ onReady:/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ function/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ ()/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ {
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/uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ /uploads/projects/swan-docs/program-docs/docs/develop/api/show//uploads/projects/swan-docs/program-docs/docs/develop/api/show/ canvasContext.setGlobalAlpha(0.2);
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});

:::