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pplokijuhyg 2020-02-11 14:21:37 +08:00
parent 4fcb1ef49e
commit 0ee7b8742d
1 changed files with 2 additions and 4 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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@ -24,15 +24,13 @@ console.log(canvas2.style.width)
x:0, x:0,
y:0 y:0
}).then(canvas => { }).then(canvas => {
//canvas就是绘制完成的画板 //canvas就是绘制完成的画板对象
}); });
} }
}) })
``` ```
html2canvas参数参考官网 重点介绍canvas那一部分 html2canvas
context.scale(x 倍数, y 倍数); //画板放大指定倍数 context.scale(x 倍数, y 倍数); //画板放大指定倍数
***
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 为什么要再乘以window.devicePixelRatio