baoshi-was/database/migrations/2020_05_25_093853_change_waybills_table.php

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class ChangeWaybillsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('waybills',function (Blueprint $table){
            $table->string('mileage')->nullable()->comment('里程');
            $table->bigInteger('amount')->nullable()->comment('件数');
            $table->string('inquire_tel')->nullable()->comment('查件电话');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('waybills',function (Blueprint $table){
            $table->dropColumn('mileage');
            $table->dropColumn('amount');
            $table->dropColumn('inquire_tel');
        });
    }
}