1、增加字段类型

2、修复增加字段时的一处bug

extend/com/Datatable.php

@@ -19,14 +19,14 @@ use think\facade\Db;
 class Datatable {
 
 	protected $table; /*数据库操作的表*/
-	protected $fields             = array(); /*数据库操作字段*/
+	protected $fields             = []; /*数据库操作字段*/
 	protected $charset            = 'utf8'; /*数据库操作字符集*/
 	public $prefix                = ''; /*数据库操作表前缀*/
 	protected $model_table_prefix = ''; /*模型默认创建的表前缀*/
 	protected $engine_type        = 'MyISAM'; /*数据库引擎*/
 	protected $key                = 'id'; /*数据库主键*/
 	public $sql                   = ''; /*最后生成的sql语句*/
-	protected $typeAlist          = array(
+	protected $typeAlist          = [
 		"text"     => "VARCHAR",
 		"string"   => "VARCHAR",
 		"password" => "VARCHAR",
@@ -43,7 +43,8 @@ class Datatable {
 		"image"    => "INT",
 		"images"   => "VARCHAR",
 		"attach"   => "VARCHAR",
-	);
+		"fieldlist" => "text"
+	];
 
 	/**
 	 * 初始化数据库信息
@@ -107,7 +108,7 @@ class Datatable {
 	public function columField($table, $attr = array()) {
 		$field_attr['table'] = $table ? $this->getTablename($table, true) : $this->table;
 		$field_attr['name'] = $attr['name'];
-		$field_attr['type']  = $attr['type'] ? $this->typeAlist[$attr['type']] : 'varchar';
+		$field_attr['type']  = ($attr['type'] && isset($this->typeAlist[$attr['type']])) ? $this->typeAlist[$attr['type']] : 'varchar';
 		if (intval($attr['length']) && $attr['length']) {
 			$field_attr['length'] = "(" . $attr['length'] . ")";
 		} else {