Laravel migrate 报错：Syntax error or access violation: 1071 Specified key was too long; max key long

问题：

运行：php artisan migrate
报错： Syntax error or access violation: 1071 Specified key was too long; max key length is 1000 bytes

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解决办法： 在 SegmentFault上查找到的解决方法。

解释：在官方文档里找到的答案

Index Lengths & MySQL / MariaDB
Laravel uses the utf8mb4 character set by default, which includes support for storing "emojis" in the database. If you are running a version of MySQL older than the 5.7.7 release or MariaDB older than the 10.2.2 release, you may need to manually configure the default string length generated by migrations in order for MySQL to create indexes for them. You may configure this by calling the Schema::defaultStringLength method within your AppServiceProvider:

use Illuminate\Support\Facades\Schema;

/**
 * Bootstrap any application services.
 *
 * @return void
 */
public function boot()
{
    Schema::defaultStringLength(191);
}

注意：在 AppServiceProvider里添加的是以下两行代码：

use Illuminate\Support\Facades\Schema;
Schema::defaultStringLength(191);