Kotlin-jvm 和 Kotlin-js 之间 KClass 的不同行为

Question

我写了一些 kotlin 代码来显示在 jvm 和 js 中执行的行为差异。我该如何解决这个问题？

这个等式：booleanKClass == genericKclass 对于 JVM 是正确的但是 false 对于 JS

我将粘贴代码，然后是控制台生成的输出（一个用于 jvm，一个用于 js）如果您从多平台项目中调用 test1()，您会像我一样看到它。我正在使用 kotlin_version = ‘1.2.51’

fun test1() {
    val values = PropertyDelegate()
    val result = Result(values)
    println("This will call the delegate getter.")
    println("result.success is not really important but: ${result.success}")
    println("This will call the delegate setter...")
    result.success = true
    println("end")
}

class Result(del: PropertyDelegate) {
    var success: Boolean by del
}

class PropertyDelegate() {
    inline operator fun <reified T> getValue(thisRef: Any?, property: KProperty<*>): T {
        val booleanKClass = Boolean::class
        val genericKclass = T::class
        println("getValue (booleanKClass == genericKclass) is ${booleanKClass == genericKclass}")
        return true as T
    }

    inline operator fun <reified T> setValue(thisRef: Any?, property: KProperty<*>, value: T) {
        val booleanKClass = Boolean::class
        val genericKclass = T::class
        println("setValue (booleanKClass == genericKclass) is ${booleanKClass == genericKclass}")
    }
}

JVM 输出：

This will call the delegate getter.
getValue (booleanKClass == genericKclass) is true
result.success is true
This will call the delegate setter...
setValue (booleanKClass == genericKclass) is true
end

JS 输出：

This will call the delegate getter.
getValue (booleanKClass == genericKclass) is false
result.success is not really important but: true
This will call the delegate setter...
setValue (booleanKClass == genericKclass) is false
end

Answer 1

自 Kotlin 1.3.41 起它按预期工作。

打印：

This will call the delegate getter.
getValue (booleanKClass == genericKclass) is true
result.success is not really important but: true
This will call the delegate setter...
setValue (booleanKClass == genericKclass) is true
end

Kotlin-jvm 和 Kotlin-js 之间 KClass 的不同行为

Different behavior of KClass between Kotlin-jvm and Kotlin-js

reflection

kotlin

kotlin-js