您可以使用索引表达式来获取枚举的值：

You can use an index expression to get the value of the enum:

enum Foo {
    A = "A",
    B = "BB"
}

var foo : Foo = Foo["A"];
var fooB : Foo = Foo["B"];

请注意，键将是成员的名称而不是值。

Note that the key will be the name of the member not the value.

您也可以使用类型断言，但如果分配了错误的值，则不会出错：

You could also use a type assertion, but you will not get errors if you assign a wrong value:

var foo : Foo = "A"  as Foo;
var foo : Foo = "D"  as Foo; // No error