If the requested type is image/jpeg or image/webp,then the second
argument,if it is between 0.0 and 1.0,is treated as indicating image
quality; if the second argument is anything else,the default value
for image quality is used. Other arguments are ignored.
但我无法找到告诉我默认值实际是什么的任何地方.
解决方法
The second argument,if it is a number in the range 0.0 to 1.0 inclusive,must be treated as the desired quality level. If it is not a number or is outside that range,the user agent must use its default value,as if the argument had been omitted.
编辑:根据one user,Firefox的默认值为0.92.
You can specify the JPEG quality as the second parameter to the toDataURL function. The default quality in Firefox is 0.92 (92%).
根据这个webkit bug report Chrome使用相同的.
…Adds a libjpeg-based image encoder for Skia bitmaps. Default encoding quality is 92 to match Mozilla…
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