!DOCTYPE html>
html>
head lang="en">
  meta charset="UTF-8">
  title>/title>
  style>
  /style>
/head>
script type="text/javascript">
  //下面用于图片上传预览功能
  function setImagePreview(avalue) {



    var docObj=document.getElementById("doc");

    var imgObjPreview=document.getElementById("preview");
    if(docObj.files docObj.files[0])
    {
//火狐下，直接设img属性
      imgObjPreview.style.display = 'block';
//imgObjPreview.src = docObj.files[0].getAsDataURL();

//火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式
      imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
    }
    else
    {
//IE下，使用滤镜
      docObj.select();
      var imgSrc = document.selection.createRange().text;
      var localImagId = document.getElementById("localImag");
//必须设置初始大小
      localImagId.style.width = "150px";
      localImagId.style.height = "180px";
//图片异常的捕捉，防止用户修改后缀来伪造图片
      try{
        localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
        localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;

      }
      catch(e)
      {
        alert("您上传的图片格式不正确，请重新选择!");
        return false;
      }
      imgObjPreview.style.display = 'none';
      document.selection.empty();
    }
    ajaxFileUpload(); //上传图片
    return true;

  }

/script>
body>
center>
  label>
    @foreach ($arr as $key=>$val)
      {{-- img src="{{$val->n_img}}" alt="" height="100" width="100" class="qq">
      input type="file" id="file1" style="VISIBILITY: hidden" >--}}
      img id="preview" width="100" height="100" src="{{$val->n_img}}">
      input type="file" name="touxiang" id="doc" style="display:none" οnchange="javascript:setImagePreview();">
    @endforeach
  /label>
/center>
/body>
/html>
script src="./js.js">/script>
script src="./ajaxfileupload.js">/script>

script type="text/javascript">



  function ajaxFileUpload() {


    $.ajaxFileUpload
    (
        {
          url: "{{url('up_img')}}", //用于文件上传的服务器端请求地址
          secureuri: false, //是否需要安全协议，一般设置为false
          fileElementId: 'doc'
        }
    );
    return false;
  }
/script>

?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Http\Requests;

use DB;
use Illuminate\Support\Facades\Input;
class ImgController extends Controller
{
  public function Index(){
    $arr= DB::select("SELECT * FROM r_nav limit 1");
    return view('index',['arr'=>$arr]);
  }
  //修改图片
  public function up_img(Request $Request){
    $n_file = Input::file('touxiang');
    if($n_file->isValid()){
      //获取文件名称
      $clientName = $n_file -> getClientOriginalName();
      $realPath = $n_file -> getRealPath();
      //获取图片格式
      $entension = $n_file -> getClientOriginalExtension();
      //图片保存路径
      $mimeTye = $n_file -> getMimeType();
      $path = $n_file -> move('IMG');
    }
    $ress = DB::table('r_nav')->where('n_id',11)->update(['n_img'=>$path]);
  }
}