flutter/dart 语法点记录

Posted 2022-12-09 山水相逢-z

1.??=运算符 如果 ??= 运算符前面的变量为null，则赋值，否则不赋值

  var param1 = "hello", param2 = null;
  param1 ??= "world";
  param2 ??= "world";
  print("param1 = $param1"); // param1 = hello
  print("param2 = $param2"); // param2 = world