chrome 點擊上傳文件選擇框會延遲幾秒纔會顯示 反應很慢

chrome52.0.2743.80以上，

accept: {
  title: 'Images',
  extensions: 'jpg,jpeg,png',
  mimeTypes: 'image/*'
}

改爲

accept: {
  title: 'Images',
  extensions: 'jpg,jpeg,png',
  mimeTypes: 'image/jpg,image/jpeg,image/png'   //修改這行
}