Angular2文件输入onchange

然后你的组件fileChangeEvent()为

public fileChangeEvent(fileInput: any){
      if (fileInput.target.files && fileInput.target.files[0]) {
        var reader = new FileReader();

        reader.onload = function (e : any) {
            $('#preview').attr('src', e.target.result);
        }

        reader.readAsDataURL(fileInput.target.files[0]);
    }
}

displayPhoto(fileInput) {
  if (fileInput.target.files && fileInput.target.files[0]) {
  const reader = new FileReader();

  reader.onload = ((e) => {
    this.imageSrc = e.target['result'];
  });

  reader.readAsDataURL(fileInput.target.files[0]);
}