npm 中的任何库都可以做到这一点?
axios.get('http://www.freeiconspng.com/uploads/profile-icon-9.png', {
transformRequest: [function (data) {
return data;
}],
transformResponse: [function (data) {
return data;
}],
});
我认为这是 StackOverflow 的问题。
对于任何寻找解决方案的人,我有以下代码:
get('/getImg', {
responseType: 'arraybuffer'
})
.then(function(result) {
console.log(_imageEncode(result.data))
})
function _imageEncode (arrayBuffer) {
let u8 = new Uint8Array(arrayBuffer)
let b64encoded = btoa([].reduce.call(new Uint8Array(arrayBuffer),function(p,c){return p+String.fromCharCode(c)},''))
let mimetype="image/jpeg"
return "data:"+mimetype+";base64,"+b64encoded
}
这是我们的解决方案,它就像一个魅力
return axios.get('http://example.com/image.png', { responseType: 'arraybuffer' })
.then((response) => {
let image = btoa(
new Uint8Array(response.data)
.reduce((data, byte) => data + String.fromCharCode(byte), '')
);
return `data:${response.headers['content-type'].toLowerCase()};base64,${image}`;
});
这行不通的原因是 axios 将所有内容都放在 json 对象中。 由于您不能将二进制文件放入 json 对象中,因此它会将其转换为破坏二进制文件的字符串。
这对我来说很完美:
function getBase64(url) {
return axios
.get(url, {
responseType: 'arraybuffer'
})
.then(response => new Buffer(response.data, 'binary').toString('base64'))
}
如果您像我一样在节点上并且使用v >= 6 ,则发生了变化,您应该使用Buffer.from或类似的。
function getBase64(url) {
return axios
.get(url, {
responseType: 'arraybuffer'
})
.then(response => Buffer.from(response.data, 'binary').toString('base64'))
}
参考安全缓冲区new Buffer()' was deprecated since v6. Use 'Buffer.alloc()' or 'Buffer.from()' (use 'https://www.npmjs.com/package/safe-buffer' for '<4.5.0') instead
@sean-hill 你知道为什么它不能得到图像的第一个标记吗? 由于某种原因,我没有看到data:image/png;base64,
部分,这使得 base64 数据无效
这对我有用
function getImage(imageUrl) {
var options = {
url: `${imageUrl}`,
encoding: "binary"
};
return new Promise(function (resolve, reject) {
request.get(options, function (err, resp, body) {
if (err) {
reject(err);
} else {
var prefix = "data:" + resp.headers["content-type"] + ";base64,";
var img = new Buffer(body.toString(), "binary").toString("base64");
// var img = new Buffer.from(body.toString(), "binary").toString("base64");
var dataUri = prefix + img;
resolve(dataUri);
}
})
})
}
function getImage(imageUrl) {
var options = {
url: `${imageUrl}`,
encoding: "binary"
};
request.get(options, function (err, resp, body) {
if (err) {
reject(err);
} else {
var prefix = "data:" + resp.headers["content-type"] + ";base64,";
var img = new Buffer(body.toString(), "binary").toString("base64");
// var img = new Buffer.from(body.toString(), "binary").toString("base64");
var dataUri = prefix + img;
}
})
}
return axios.get('http://site.com/img.png', { responseType: 'arraybuffer' })
.then(response => `data:${response.headers['content-type']};base64,${btoa(String.fromCharCode(...new Uint8Array(response.data)))}`);
return axios.get('http://site.com/img.png', { responseType: 'arraybuffer' }) .then(response => `data:${response.headers['content-type']};base64,${btoa(String.fromCharCode(...new Uint8Array(response.data)))}`);
节点版本:
return axios.get(url, { responseType: 'arraybuffer' }).then(res => {
;`data:${res.headers['content-type']};base64,${Buffer.from(String.fromCharCode(...new Uint8Array(res.data)), 'binary')
.toString('base64')}`
})
@voidpls
你的方法导致错误!
Uncaught RangeError: Maximum call stack size exceeded
它导致从toa(String.fromCharCode(...new Uint8Array(response.data)))
你可以试试这张图片
最有用的评论
如果您像我一样在节点上并且使用v >= 6 ,则发生了变化,您应该使用Buffer.from或类似的。
参考安全缓冲区
new Buffer()' was deprecated since v6. Use 'Buffer.alloc()' or 'Buffer.from()' (use 'https://www.npmjs.com/package/safe-buffer' for '<4.5.0') instead