kotlin，javascript协程

配置

buildscript {
    ext.kotlin_version = '1.2.0'

    repositories {
        mavenCentral()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    }
}

group 'com.itheima'
version '0.0.1-SNAPSHOT'

apply plugin: 'kotlin2js'

repositories {
    mavenCentral()
}

dependencies {
    compile "org.jetbrains.kotlin:kotlin-stdlib-js:$kotlin_version"
    compile 'org.jetbrains.kotlinx:kotlinx-coroutines-core-js:0.22.2'

}
task assembleWeb(type: Sync) {
    configurations.compile.each { File file ->
        from(zipTree(file.absolutePath), {
            includeEmptyDirs = false
            include { fileTreeElement ->
                def path = fileTreeElement.path
                path.endsWith(".js") && (path.startsWith("META-INF/resources/") ||
                        !path.startsWith("META-INF/"))
            }
        })
    }
    from compileKotlin2Js.destinationDir
    into "${projectDir.parent}/src/main/resources/static"

    dependsOn classes
}

assemble.dependsOn assembleWeb

suspend fun get(path: String): String = suspendCoroutine { cont ->
    var request = XMLHttpRequest()
    request.open("GET", path, true)
    request.onreadystatechange = {
        if(request.readyState==XMLHttpRequest.DONE){
            cont.resume(request.responseText)
        }
    }
    request.send()
}

看似同步的代码，实际异步的逻辑

launch {
       val result = get("/frontend.js")
       println("result:"+result)
   }