CKEditor4 添加插入各大视频网站插件

参考链接：
https://docs.ckeditor.com/ckeditor4/docs/#!/guide/dev_media_embed
https://iframely.com/
https://iframely.com/docs/ckeditor

ckedit配置参数

editorConfig: {
          extraPlugins: 'uploadimage,image2,embed',  //配置插件
          imageUploadUrl: Constants.SERVER_HOST + '/ckeditor/upload/image.json',
          uploadUrl: Constants.SERVER_HOST + '/ckeditor/upload/file.json',
          filebrowserUploadUrl: Constants.SERVER_HOST + '/ckeditor/browser/upload/file.json',   //上传文件的地址
          embed_provider: '//iframe.ly/api/oembed?url={url}&callback={callback}&api_key=44e5dc002a048d3a98db27'  //配置视频资源的地址，这里配置的是iframely的api地址
}