{"json_modified": "2016-03-28T08:38:34.818049", "uuid": "cace2eeb-4ab9-4a61-ba71-b19ff44176ee", "title": "CanvasRenderingContext2D.globalAlpha", "url": "/en-US/docs/Web/API/CanvasRenderingContext2D/globalAlpha", "tags": ["Canvas", "Reference", "API", "Property", "CanvasRenderingContext2D"], "translations": [{"uuid": "1799b9bb-72f2-443b-85b2-25f00f26eb2a", "title": "CanvasRenderingContext2D.globalAlpha", "url": "/zh-CN/docs/Web/API/CanvasRenderingContext2D/globalAlpha", "tags": [], "summary": "<code><strong>CanvasRenderingContext2D</strong></code><strong><code>.globalAlpha</code></strong> \u662f Canvas 2D API \u7528\u6765\u63cf\u8ff0\u5728canvas\u4e0a\u7ed8\u56fe\u4e4b\u524d\uff0c\u8bbe\u7f6e\u56fe\u5f62\u548c\u56fe\u7247\u900f\u660e\u5ea6\u7684\u5c5e\u6027\u3002\u00a0\u6570\u503c\u7684\u8303\u56f4\u4ece 0.0 \uff08\u5b8c\u5168\u900f\u660e\uff09\u52301.0 \uff08\u5b8c\u5168\u4e0d\u900f\u660e\uff09\u3002", "localization_tags": [], "locale": "zh-CN", "last_edit": "2016-02-25T19:16:32", "review_tags": ["editorial"]}], "modified": "2016-02-02T03:39:02", "label": "CanvasRenderingContext2D.globalAlpha", "localization_tags": [], "locale": "en-US", "id": 128787, "last_edit": "2015-07-24T05:51:56", "summary": "The <code><strong>CanvasRenderingContext2D</strong></code><strong><code>.globalAlpha</code></strong> property of the Canvas 2D API specifies the alpha value that is applied to shapes and images before they are drawn onto the canvas. The value is in the range from 0.0 (fully transparent) to 1.0 (fully opaque).", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Options", "title": "Options"}, {"id": "Examples", "title": "Examples"}, {"id": "Using_the_globalAlpha_property", "title": "Using the "}, {"id": "HTML", "title": "HTML"}, {"id": "JavaScript", "title": "JavaScript"}, {"id": "Playable_code", "title": "Playable code"}, {"id": "A_globalAlpha_example", "title": "A "}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "Gecko-specific_notes", "title": "Gecko-specific notes"}, {"id": "WebKitBlink-specific_notes", "title": "WebKit/Blink-specific notes"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/CanvasRenderingContext2D/globalAlpha", "review_tags": []}