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pplokijuhyg 2020-02-11 14:19:07 +08:00
parent ea15408525
commit 9d9c01c3cc
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前端/前端通过页面(dom)生成图片并放大倍数.md
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@ -40,4 +40,4 @@ context.scale(x 倍数, y 倍数); //画板放大指定倍数
canvas2.width = w * times * window.devicePixelRatio; //指定画板宽度 canvas2.width = w * times * window.devicePixelRatio; //指定画板宽度
canvas2.height = h * times * window.devicePixelRatio; //指定画板宽度 canvas2.height = h * times * window.devicePixelRatio; //指定画板宽度
为什么要再乘以window.devicePixelRatio 为什么要再乘以window.devicePixelRatio
这个其实是设备的dpi，可能 这个其实是设备的dpi，