Html 将 json 字符串保存到客户端电脑（使用 HTML5 API）
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Save json string to client pc (using HTML5 API)
提问by bsr
I read few older thread about the same, but seen the file API changed a lot recently. My requirement is to save a json file (data is locally in indexdDB, but I need a way to back it up). Since I use indexdDB, I only target recent browsers, mainly chrome. So, it it possible to save data (json string) to client computer?
我读了一些旧线程，但最近看到文件 API 发生了很大变化。我的要求是保存一个 json 文件（数据在本地 indexdDB 中，但我需要一种方法来备份它）。由于我使用 indexdDB，所以我只针对最近的浏览器，主要是 chrome。那么，是否可以将数据（json 字符串）保存到客户端计算机？
I have seen http://eligrey.com/demos/FileSaver.js/, but is there a way to do it natively?
我看过http://eligrey.com/demos/FileSaver.js/，但有没有办法在本地做到这一点？
Thanks.
谢谢。
回答by potatosalad
You can use a Bloband the HTML5 a[download]feature to provide a JSON backup download:
您可以使用Blob和 HTML5a[download]功能来提供 JSON 备份下载：
var data = {a:1, b:2, c:3};
var json = JSON.stringify(data);
var blob = new Blob([json], {type: "application/json"});
var url = URL.createObjectURL(blob);
var a = document.createElement('a');
a.download = "backup.json";
a.href = url;
a.textContent = "Download backup.json";
Here is a jsfiddle example: http://jsfiddle.net/potatosalad/yuM2N/
这是一个 jsfiddle 示例：http: //jsfiddle.net/potatosalad/yuM2N/
回答by markasoftware
Yes, you can. This assumes that you have the json in text:
是的你可以。这假设您在text以下位置拥有 json ：
var toDownload=new Blob([text],{type:'x-whatever/x-backup'});
var link=window.URL.createObjectURL(toDownload);
window.location=link;
that is untested, but it should work.
这是未经测试的，但它应该可以工作。
回答by Samuel Bushi
You can use FileSaver.js.
您可以使用FileSaver.js。
Sample code:
示例代码：
//include the js file in html.
<script src="FileSaver.min.js"></script>
// other code ...
//use it here.
var myjson= "{a:3, b:4}";
var blob = new Blob([myjson], {type: "application/json"});
var saveAs = window.saveAs;
saveAs(blob, "my_outfile.json");
Use JSON.stringifyto create a string from JSON.
用于JSON.stringify从 JSON 创建字符串。
Fiddle: https://jsfiddle.net/9w9ofec4/3/
回答by Stefan Krüger
based on potatosalad answeri experimented with an 'self' updating link:
jsfiddle
基于土豆沙拉的答案，我尝试了一个“自我”更新链接：
jsfiddle
function saveAsFile(link, content, filename) {
var blob = new Blob([content], {type: "text/text"});
var url = URL.createObjectURL(blob);
// update link to new 'url'
link.download = filename + ".txt";
link.href = url;
}
saveAsFile(this, "YourContent", "HelloWorldFile");
the function saveAsFile()needs the calling aelement as first argument.
than it updates the hreftarget to the new blob.
该函数saveAsFile()需要调用a元素作为第一个参数。
比它将href目标更新为新的 blob。
