input file上传图片设置的实例代码

<div>纯input与type</div>
  <input type="file">

  <div>指明需要图片</div>
  <input type="file" accept='image/*'>

  <div>指明需要多张图片</div>
  <input type="file" multiple accept='image/*'>

  <div>指明调用摄像头获取图片</div>
  <input type="file" capture='camera' accept='image/*'>

  <div>指明调用摄像头并多张图片</div>
  <!-- multiple 无效 -->
  <input type="file" multiple capture='camera' accept='image/*'>