JavaScript 画像アップロード コードのカプセル化

function uploadImages(picker, url, callback) {
  var img_uploader = WebUploader.create({
    auto: true,
    server: url,
    pick: picker,
    fileNumLimit: 1,
    fileSingleSizeLimit: 2097152, // 2M
    accept: {
      title: 'Images',
      extensions: 'gif,jpg,jpeg,bmp,png',
      // mimeTypes: 'image/*'
    },
    compress: {
      width: 300,
      compressSize: 102400 // < 100kb 不压缩
    },
  })

  var fileType = [&#39;image/jpeg&#39;, &#39;image/jpg&#39;, &#39;image/gif&#39;, &#39;image/png&#39;, &#39;image/bmp&#39;]

  img_uploader.on(&#39;beforeFileQueued&#39;, function(file) {

    fileType.some(function(name) {
      return file.type === name
    })

    ? &#39;&#39; : alert(&#39;请上传正确的图片！&#39;)

  })

  img_uploader.on(&#39;uploadSuccess&#39;, function(file, res) {
    callback(file, res)
  })

  img_uploader.on(&#39;uploadError&#39;, function(file, reason) {
    console.log(reason);
  })

  img_uploader.on(&#39;uploadComplete&#39;, function(file) {
    img_uploader.reset()
  })

}

<p id="zTu">图片</p>

var coverImage; 
initImageUploader();
function initImageUploader(){
  var fileUrl = 你想上传的地址;
  uploadImages('#imagePicker', fileUrl, function(file, res) {
   coverImage = res.url
   $(&#39;#zTu&#39;).get(0).innerHTML = &#39;<p class="file-item thumbnail"><img style="max-height:180px" src="&#39; + res.url + &#39;" /></p>&#39;
  })
 }