參數'age'不能有'null'的值，因為它的類型，但隱式默認值是'null'。 嘗試添加一個顯式的非'null'默認值或'required'
The?parameter?'age'?can't?have?a?value?of?'null'?because?of?its?type,?but?the?implicit?default?value?is?'null'. Try?adding?either?an?explicit?non-'null'?default?value?or?the?'required'
運行報錯
2021-08-12
一旦sdk升級到2.12以上之后，那么就會執行空安全檢查，如果是非空參數放在可選參數列表中要有默認值或者通過required修飾?？蓞⒖歼@篇文章?? flutter- 空安全