使用pcs api往免费的百度网盘上传下载文件

//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();
    }
}