记录一下在小程序中put文件
第一步，wx.chooseMessageFile，获取上传的文件的临时路径；
第二步， wx.getFileSystemManager().readFile，读取文件ArrayBuffer;
第三步，构造一个multi/formdata格式的请求，boundary头部和boundary尾部；
第四步，将boundary头部、文件ArrayBuffer、boundary尾部转换成Array，并按顺序拼接到一起；
第五步，将最终结果转换为Uint8Array；
第六步，put请求

供参考
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wx.chooseMessageFile({
count: 6,
type: ‘all’,
success(res) {
var tempFilePaths = res.tempFiles;
var filename = tempFilePaths[0].name;
wx.getFileSystemManager().readFile({
filePath: tempFilePaths[0].path,
success:fileStream=>{
var fileArray = new Uint8Array(fileStream.data);
var start_boundary = ‘\r\n–yourboundary\r\n’ + ‘Content-Disposition: form-data; name=“data”; filename="’ + yourfilename+ ‘"\r\n’+‘Content-Type:application/octet-stream’ +’\r\n\r\n’ ;
var end_boundary = ‘\r\n–yourboundary–’;
var startArray = [];
for (var i = 0; i < start_boundary.length; i++) {
startArray.push(start_boundary.charCodeAt(i));
}
var endArray = [];
for (var i = 0; i < end_boundary.length; i++) {
endArray.push(end_boundary.charCodeAt(i));
}
var totalArray = startArray.concat(Array.prototype.slice.call(fileArray), endArray);
var typedArray = new Uint8Array(totalArray);
wx.request({
url: ‘yoururl’,
method: ‘PUT’,
header: {
‘content-type’: ‘multipart/form-data; boundary=yourboundary’
},
data: totalArray.buffer,
success: function (res) {
…
}})
}})
}
)}
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