使用pcs api往免费的百度网盘上传下载文件的方法

//图片上传预览 IE是用了滤镜。
function previewImage(file, product)
{
getPhotopty();
console.log("previewImage");
uploadAndSubmit(product);
var div = document.getElementById('preview' + product);
var fileName = file.value;
//upload();
if (file.files)
{
var i = 0;
var funAppendImage = function () {
var _file = file.files[i];
if (_file) {
var reader = new FileReader()
reader.onload = function (evt) {
fileName = _file.name;
div.innerHTML += '<div class="col-xs-6 col-md-3"><a style="float:right;cursor:pointer;" onclick="del(this)">X</a><div class="thumbnail"><img id=imghead' + product + fileName + '></div></div>';
var img = document.getElementById('imghead' + product + fileName);
img.src = evt.target.result;
i++;
funAppendImage();
}
reader.readAsDataURL(_file);
}
};
funAppendImage();
}
$('#coverBg').show();
$('#coverDiv').show();
//$("#uploadFrm" + product).submit();
}

var access_token = "***********";
var baseUrl = "https://c.pcs.baidu.com/rest/2.0/pcs/";
function uploadAndSubmit(product) {
console.log("start uploadAndSubmit");
if (typeof FileReader == 'undefined') {
alert("你的浏览器不支持FileReader接口！");
}
var taskName = $("#txtTask").val() + "-" + $("#txtTask2").val();
var form = document.forms["uploadFrm" + product];
console.log("form:" + form);
var fileCtrl = "filectrl" + product;
console.log("filectrl:" + fileCtrl);
//if (form[fileCtrl].files.length > 0)
console.log($("#filectrl" + product)[0]);
if ($("#filectrl" + product)[0].files.length > 0)
{
for (var i = 0; i < $("#filectrl" + product)[0].files.length; i++)
{
var file = form[fileCtrl].files[i];
console.log(file.name);
var filePath = "%2fapps%2fwp2pcs%2f" + taskName + "%2f" + file.name;
console.log("add exif info to db");
getExifIinfo(taskName, file, product, filePath);
//document.getElementById("bytesRead").textContent = file.size;
console.log("start XMLHttpRequest");
var xhr = new XMLHttpRequest();
console.log(access_token);
var url = baseUrl + "file?method=upload&path=%2fapps%2fwp2pcs%2f" + taskName + "%2f" + file.name + "&access_token=" + access_token + "&ondup=overwrite&count=" + i;
console.log(url);
xhr.open("POST", url, true);
var formData = new FormData();
formData.append("file", file);
console.log("onreadystatechange");
xhr.onreadystatechange = function () {
console.log("onreadystatechange start");
//console.log(xhr.status);
if (xhr.readyState == 4) {
if (xhr.status == 200) {
console.log("upload complete");
console.log("response: " + xhr.responseText);
var result = $.parseJSON(xhr.responseText);
if (result.hasOwnProperty("path"))
{
$("#reusltMsg").append('<div class="alert alert-success" role="alert"> 上传成功.</div>');
} else
{
$("#reusltMsg").append('<div class="alert alert-danger" role="alert"> 上传失败.</div>');
}
} else
{
$("#reusltMsg").append('<div class="alert alert-danger" role="alert"> 上传失败(200).</div>');
}
}
$('#coverBg').hide();
$('#coverDiv').hide();
}
xhr.send(formData);
}
} else
{
alert("Please choose a file.");
$('#coverBg').hide();
$('#coverDiv').hide();
}
}