laravel5.4上传EXCEL并解析

composer require maatwebsite/excel ~2.1.0

public function postLeadExcel(Request $request)
{  
    $file = $request->file('leadFile');
    if($file -> isValid()){
        $clientName = $file->getClientOriginalName();
        $extension = $file->getClientOriginalExtension();
        $newName = md5(date('ymdhis').$clientName).".".$extension;
        $uploadDir = dirname($_SERVER['SCRIPT_FILENAME']).'/upload/';
        $path = $uploadDir.$newName;
        $file->move($uploadDir,$newName);
        $excel_data = Excel::load($path)->getSheet(0)->toArray();//这就是excel表的数据
        // do some thing 
    }
}

$("#do_lead").on('click',function(){
    var $this = $(this);
    $this.prop('disabled', true);
    var filepath = $("input[name='leadFile']").val();
    var extStart = filepath.lastIndexOf(".");
    var ext = filepath.substring(extStart, filepath.length).toUpperCase();
    if (ext != ".XLSX" && ext != ".XLS") {
        alert("请上传xlsx,xls格式的文件");
    } 
    else {
        $("#lead_form").submit();
    }
});