影像采集-拍照 （用自己的插件 ）简单逻辑

 var dataURItoBlob = function (dataURI) {
        var byteString = atob(dataURI.split(‘,‘)[1]);
        var mimeString = dataURI.split(‘,‘)[0].split(‘:‘)[1].split(‘;‘)[0];
????      var ab = new ArrayBuffer(byteString.length);
        var ia = new Uint8Array(ab);
        for (var i = 0; i < byteString.length; i++) {
            ia[i] = byteString.charCodeAt(i);
        }
        return new Blob([ab], {type: mimeString});
    },
    fd = new FormData(),
    fname = (new Date().getTime()) + parseInt(Math.random() * 1000, 10) + ".jpg",
    blob = dataURItoBlob("data:image/jpg;base64," + that.imgEditerPlugin.encodeBase64());

fd.append("file", blob, fname);
ajax.ajax({
    contentType: false,
    cache: false,
    url: uploadUrl,
    type: "POST",
    processData: false,
    data: fd
}).then(function (result) {});