Html 使用 HTML5 FileSystem API 将文件写入桌面
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Writing file to desktop using HTML5 FileSystem API
提问by Johan
I'm playing around a bit with the FileSystem API.
我正在玩弄FileSystem API。
I've found a lot of examples where you generate a download link and let the user download the file the "browser way".
我发现了很多示例，您可以在其中生成下载链接并让用户以“浏览器方式”下载文件。
I would like to know two things:
我想知道两件事：
Is there any way to write the ajax result in the fiddle as a file directly to the disk (without any type of prompt). Like to the user's desktop for example.
Is blob the most suitable format for this?
有没有办法将小提琴中的ajax结果作为文件直接写入磁盘（没有任何类型的提示）。以用户的桌面为例。
blob 是最合适的格式吗？
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function(){
if (this.readyState == 4 && this.status == 200){
console.log(this.response, typeof this.response);
var img = document.getElementById('img');
var url = window.URL = window.webkitURL;
img.src = url.createObjectURL(this.response);
}
}
xhr.open('GET', 'http://www.newyorker.com/online/blogs/photobooth
/NASAEarth-01.jpg');
xhr.responseType = 'blob';
xhr.send();
采纳答案by Paul Draper
Unfortunately, writing to regular files is not currently possible (despite the accepted answer Modifying Local Files Using HTML5 and JavaScript).
不幸的是，目前无法写入常规文件（尽管接受了使用 HTML5 和 JavaScript 修改本地文件的答案）。
You can only write to the sandboxed filesystem.
您只能写入沙盒文件系统。
FYI, you can do this in a Chrome Packaged App: http://developer.chrome.com/apps/fileSystem.htmlBut even then the user must at least choose the file first. Writing to any file would be a serious security hole.
仅供参考，您可以在 Chrome Packaged App 中执行此操作：http: //developer.chrome.com/apps/fileSystem.html但即便如此，用户至少必须先选择文件。写入任何文件将是一个严重的安全漏洞。
What problem are you really trying to solve?
你真正想解决什么问题？
回答by Aparajith Sairam
Please note that Filesystem API is no longer part of the standard's specification, as specified at: http://www.w3.org/TR/file-system-api/
请注意，文件系统 API 不再是标准规范的一部分，具体如下：http: //www.w3.org/TR/file-system-api/
EDIT: Quoting the specification in case the link changes: "File API: Directories and System W3C Working Group Note 24 April 2014
编辑：引用规范以防链接更改：“文件 API：目录和系统 W3C 工作组注释 2014 年 4 月 24 日
Work on this document has been discontinued and it should not be referenced or used as a basis for implementation."
本文件的工作已停止，不应作为参考或用作实施的基础。”
(This does not relate to the question directly, but it is essential to know not to use the FileSystem API further.)
（这与问题没有直接关系，但必须知道不要进一步使用 FileSystem API。）
Another link: http://www.html5rocks.com/en/tutorials/file/filesystem/
另一个链接：http: //www.html5rocks.com/en/tutorials/file/filesystem/
"In April 2014, it was announced on public-webapps that the Filesystem API spec should be considered dead. Other browsers have showed little interest in implementing it."
“2014 年 4 月，公共网络应用程序宣布文件系统 API 规范应该被视为已死。其他浏览器对实现它几乎没有兴趣。”
