File and FileReader by bemself · Pull Request #512 · javascript-tutorial/zh.javascript.info

File and FileReader by bemself · Pull Request #512 · javascript-tutorial/zh.javascript.info

目标章节：4-binary/04-file/article

当前上游最新 commit：0cf94e8f3

所做更改如下：

文件名	参考上游 commit	更改（理由）
article.md	`0cf94e8`	新翻译首次提交

All committers have signed the CLA.

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校对完毕，感谢翻译~

		- `lastModified` -- 上次更新的时间戳（整型日期）。

		Second, more often we get a file from `<input type="file">` or drag'n'drop or other browser interfaces. Then the file gets these from OS.
		其次，我们经常从 `<input type="file">` 或拖拽或其他浏览器接口来获取。然后，再从操作系统（OS) 中获取文件。

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[拖拽]这里两边的空格可以去掉

		- `readAsDataURL(blob)` -- to base64 data url.
		因此我们可以用它将一个 blob 转换为其他格式:
		- `readAsArrayBuffer(blob)` -- 转换为 `ArrayBuffer`,
		- `readAsText(blob, [encoding])` -- 转换为字符串（替代 `TextDecoder`）,

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[替代 TextDecoder] -> [TextDecoder 的一个替代]

		```smart header="`FileReaderSync` is available for workers only"
		For Web Workers, there also exists a synchronous variant of `FileReader`, called [FileReaderSync](https://www.w3.org/TR/FileAPI/#FileReaderSync).
		```smart header="`FileReaderSync` 只适用于 workers "
		对于 Web Workers，还有一种同步的 `FileReader` 类型，称为 [FileReaderSync](https://www.w3.org/TR/FileAPI/#FileReaderSync)。

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[类型] -> [变体]

		对于 Web Workers，还有一种同步的 `FileReader` 类型，称为 [FileReaderSync](https://www.w3.org/TR/FileAPI/#FileReaderSync)。

		Its reading methods `read*` do not generate events, but rather return a result, as regular functions do.
		FileReader 的读取方法 `read*` 并不生成事件，而是会和普通函数一样返回一个结果。

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行首多了一个空格

		`File` 对象继承自 `Blob`。

		In addition to `Blob` methods and properties, `File` objects also have `fileName` and `lastModified` properties, plus the internal ability to read from filesystem. We usually get `File` objects from user input, like `<input>` or drag'n'drop.
		除了 `Blob` 方法和属性，`File` 对象还有 `fileName` 和 `lastModified` 属性，以及从文件系统读取的内部方法。我们通常从用户输入如 `<input>` 或拖拽（drag'n'drop）来获取 `File` 对象。

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[拖拽]前多了一个空格

		- 数据 url，base-64 编码（`readAsDataURL`)。

		In many cases though, we don't have to read the file contents. Just as we did with blobs, we can create a short url with `URL.createObjectURL(file)` and assign it to `<a>` or `<img>`. This way the file can be downloaded or shown up as an image, as a part of canvas etc.
		但是，多数情况下，我们不必读取文件内容。正如我们处理 blobs 一样，我们可以通过 `URL.createObjectURL(file)` 创建一个短小的 url，并将其指定给 `<a>` 或 `<img>`。这样，文件便可以下载或者呈现为图像，作为画布（canvas）等的一部分。

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[指定给] -> [赋值给]

Please make the requested changes. After it, add a comment "/done".
Then I'll ask for a new review 👻

Thank you 💖 I updated the Progress Issue #324 🎉 🎉 🎉