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The Readasdataurl method of the FileReader object encodes the read file into the data URL. The data URL is a special technique that allows you to embed data (such as a sample) in a Web page without putting it in an external file. The advantage of using the data URL is that you do not need to send an additional HTTP request to the server to obtain additional data, and the disadvantage is that the size of the Web page may become larger. It is suitable for embedding small images, it is not recommended to encode large image files into the data URL to use. Your image file cannot exceed the browser-qualified size, or the image file cannot be read.

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