<input type="file" id="choose" capture="camera" accept="image/*"> 
JavaScript
var filechooser = document.getElementById("choose");
filechooser.onchange = function () {
var _this = $(this);
if (!this.files.length) return;
var files = Array.prototype.slice.call(this.files);
if (files.length > 1) {
alert("一次只能上传1张图片");
return;
}
files.forEach(function (file, i) {
if (!/\/(",")[1]);
var buffer = new Uint8Array(text.length);
var pecent = 0;
for (var i = 0; i < text.length; i++) {
buffer[i] = text.charCodeAt(i);
}
var blob = getBlob(buffer, type);
var formdata = new FormData();
formdata.append('imagefile', blob);
xhr.open('post', '/uploadtest');
xhr.onreadystatechange = function () {
if (xhr.readyState == 4 && xhr.status == 200) {
var jsonData = JSON.parse(xhr.responseText);
console.log(jsonData);
}
};
//利用progress事件显示数据发送进度
xhr.upload.addEventListener('progress', function (e) {
pecent = ~~(100 * e.loaded / e.total) / 2;
// 利用pecent来显示上传进度
}, false);
xhr.send(formdata);
}
function getBlob(buffer, format){
var Builder = window.WebKitBlobBuilder || window.MozBlobBuilder;
if(Builder){
var builder = new Builder();
builder.append(buffer);
return builder.getBlob(format);
} else {
return new window.Blob([ buffer ], {type: format});
}
} 

var Q = require('q');
var fs = require('fs');
var path = require('path');
var formidable = require('formidable');
var moment = require('moment');var imageUpload = function (){ };
imageUpload.prototype.useFormParseCallback = function(req){
var deferred = Q.defer();
var form = new formidable.IncomingForm();
form.parse(req, deferred.makeNodeResolver());
return deferred.promise;
};
imageUpload.prototype.uploadImageTest = function(req){
var pathName = 'uploadImgs/dealInfo/';
var uploadPath = path.join(__dirname, '../../public/', pathName);
return this.useFormParseCallback(req).then(function(files){
var file = files[1].imagefile;
var fileType = files[1].imagefile.type.split('/')[1];
var newFileName = 'upload_' + moment().format('x') + Math.random().toString().substr(2, 10) + '.' + fileType;
var readStream = fs.createReadStream(file.path);
var writeStream = fs.createWriteStream(uploadPath + newFileName);
var deferred = Q.defer();
readStream.pipe(writeStream);
readStream.on('end', deferred.makeNodeResolver());
return deferred.promise.then(function() {
fs.unlinkSync(file.path);
return {
fileName: newFileName,
filePath: '/' + pathName + newFileName,
fileSize: file.size/1024 > 1024 "MB" : ~~(file.size/1024) + "KB"
};
});
});
};
module.exports = imageUpload;

var filechooser = document.getElementById("choose");
filechooser.onchange = function () {
var _this = $(this);
if (!this.files.length) return;
var files = Array.prototype.slice.call(this.files);
if (files.length > 1) {
alert("一次只能上传1张图片");
return;
}
files.forEach(function (file, i) {
if (!/\/(",")[1]);
var buffer = new Uint8Array(text.length);
var pecent = 0;
for (var i = 0; i < text.length; i++) {
buffer[i] = text.charCodeAt(i);
}
xhr.open('post', '/uploadtest"htmlcode">

imageUpload.prototype.uploadImageTest = function(req){
var pathName = 'uploadImgs/dealInfo/';
var uploadPath = path.join(__dirname, '../../public/', pathName);
return this.useFormParseCallback(req).then(function(files){
var file = files[1].file;
var fileType = req.query.filetype "MB" : ~~(file.size/1024) + "KB"
};
});
});
};


　　修改之后的代码可以支持Android手机，包括微信浏览器。注意不是所有的Android手机都会存在该问题，如果你发现在Andriod手机上无法上传图片，尤其是在微信浏览器中，则可以尝试下上面的方法。


以上所述是小编给大家介绍的关于安卓手机微信浏览器中使用XMLHttpRequest 2上传图片显示字节数为0的解决办法，希望对大家有所帮助！