⑴ VF涓镐庢牱鎶娄竴涓琛ㄩ噷镄勬暟鎹澶嶅埗鍒板彟涓涓琛ㄤ腑锛熺敤锻戒护𨱒ュ嶅埗銆
1銆佺浜屼釜琛ㄤ笉瀛桦湪use 绗涓涓琛 to 绗浜屼釜琛2銆佺浜屼釜琛ㄥ瓨鍦use 绗浜屼釜琛append from 绗涓涓琛
