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 = ['image/jpeg', 'image/jpg', 'image/gif', 'image/png', 'image/bmp']

 

  img_uploader.on('beforeFileQueued', function(file) {

 

    fileType.some(function(name) {

      return file.type === name

    })

 

    ? '' : alert('请上传正确的图片！')

 

  })

 

  img_uploader.on('uploadSuccess', function(file, res) {

    callback(file, res)

  })

 

  img_uploader.on('uploadError', function(file, reason) {

    console.log(reason);

  })

 

  img_uploader.on('uploadComplete', function(file) {

    img_uploader.reset()

  })

 

}

<div id="zTu">图片</div>

var coverImage;

initImageUploader();

function initImageUploader(){

  var fileUrl = 你想上传的地址;

  uploadImages('#imagePicker', fileUrl, function(file, res) {

   coverImage = res.url

   $('#zTu').get(0).innerHTML = '<div class="file-item thumbnail"><img style="max-height:180px" src="' + res.url + '" /></div>'

  })

 }