Javascript 使用 blob 创建 json 文件
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Create json file using blob
提问by josaric
I have written json code in string and i want to send it using xmlhttp as .json file. Is it possible to do it with blob?
我已经用字符串编写了 json 代码，我想使用 xmlhttp 作为 .json 文件发送它。可以用blob来做吗？
var cleanScript = {
'type': 'script',
'api_key': api_key,
'data': data,
'inputs': inputs,
'timeoutSeconds': timeoutSeconds
};
var jsonse = JSON.stringify(cleanScript, null, 2);
Now json to blob?
现在json到blob？
回答by Gildas.Tambo
Try something like this
尝试这样的事情
var cleanScript = {
'type': 'script',
'api_key': api_key,
'data': data,
'inputs': inputs,
'timeoutSeconds': timeoutSeconds
};
var jsonse = JSON.stringify(cleanScript);
var blob = new Blob([jsonse], {type: "application/json"});
var url = URL.createObjectURL(blob);
var a = document.createElement('a');
a.href = url;
a.download = "backup.json";
a.textContent = "Download backup.json";
document.getElementById('json').appendChild(a);
<div id="json"></div>
回答by yarmyarch
Try the code below:
试试下面的代码：
var int2ByteArray = function(i, minByteCount) {
var result = [],
buf = code = +i,
offsetCount = 0;
while ((buf = code>>(8 * offsetCount)) || offsetCount < minByteCount) {
buf = buf & 0xFF;
++offsetCount;
result.push(buf);
}
return result.reverse();
};
var ascii2ByteArray = function(s) {
if (!s) return 0;
var result = [];
[].map.call(s, function(c) {
result = result.concat(int2ByteArray((typeof(c)).toLowerCase() == "number" ? c : c.charCodeAt(0)));
});
return result;
};
// You got the blob here, do whatever you want.
var blob = new Blob(new Uint8Array(ascii2ByteArray(jsonse)), {type:"text/json"});
The matrix is to convert a string(stringfied by JSON.stringify) in to a Uint8Array that could be used making a blob.
I happened make something like that before, hope it's useful.
矩阵是将字符串（字符串化JSON.stringify）转换为可用于制作 blob 的 Uint8Array。我之前碰巧做过这样的事情，希望它有用。
