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update

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pplokijuhyg 2020-02-11 14:18:37 +08:00
parent cb2da60102
commit ea15408525
1 changed files with 2 additions and 1 deletions
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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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@ -39,4 +39,5 @@ context.scale(x 倍数, y 倍数); //画板放大指定倍数
重点 重点
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
这个其实是设备的dpi，可能