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pplokijuhyg 2020-02-11 14:22:37 +08:00
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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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@ -31,7 +31,7 @@ console.log(canvas2.style.width)
``` ```
html2canvas与canvas参考文档 html2canvas与canvas参考文档
### 重点介绍 ### 重点介绍
context.scale(x 倍数, y 倍数); //画板放大指定倍数 context.scale(x 倍数, y 倍数); //这个是画板放大指定倍数
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