Kotlin 全栈开发之 前端 JavaScript: Getting Started with Kotlin and JavaScript with Gradle
完整工程源代码：
https://github.com/Jason-Chen-2017/kotlin-js-gradle-demo
image.png
HelloWorld.kt
package demo
import kotlin.browser.document
import kotlin.js.Date
fun say() {
println("Hello,World")
}
fun getDate(n: Int): Date {
var d = Date()
var ntime = d.getTime() + n * 24 * 3600 * 1000 // ms
return Date(ntime)
}
fun renderTable() {
val e = document.getElementById("title")
e?.innerHTML = """
<h1>Kotlin VS. JavaScript</h1>
""".trimIndent()
}
fun main(args: Array<String>) {
say()
getDate(2)
renderTable()
}
build.gradle
group 'com.easy.kotlin'
version '1.0-SNAPSHOT'
buildscript {
ext.kotlin_version = '1.2.61'
repositories {
mavenCentral()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
apply plugin: 'kotlin2js'
repositories {
mavenCentral()
}
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib-js:$kotlin_version"
testCompile "org.jetbrains.kotlin:kotlin-test-js:$kotlin_version"
}
build.doLast {
configurations.compile.each { File file ->
copy {
includeEmptyDirs = false
from zipTree(file.absolutePath)
into "${projectDir}/src/main/resources/static"
include { fileTreeElement ->
def path = fileTreeElement.path
println(path)
path == "kotlin.js"
}
}
}
}
compileKotlin2Js {
kotlinOptions.outputFile = "${projectDir}/src/main/resources/static/app.js"
kotlinOptions.moduleKind = "plain"
kotlinOptions.sourceMap = true
kotlinOptions.verbose = true
kotlinOptions.metaInfo = true
}
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>kotlinjs-demo</title>
</head>
<body>
<div id="title"></div>
<script type="text/javascript" src="../static/kotlin.js"></script>
<script type="text/javascript" src="../static/app.js"></script>
<script type="text/javascript" >
var K = app
K.demo.say()
var d = K.demo.getDate_za3lpa$(3)
console.log(d)
</script>
</body>
</html>
生成的app.js 如下：
if (typeof kotlin === 'undefined') {
throw new Error("Error loading module 'app'. Its dependency 'kotlin' was not found. Please, check whether 'kotlin' is loaded prior to 'app'.");
}
var app = function (_, Kotlin) {
'use strict';
var println = Kotlin.kotlin.io.println_s8jyv4$;
var trimIndent = Kotlin.kotlin.text.trimIndent_pdl1vz$;
function say() {
println('Hello,World');
}
function getDate(n) {
var d = new Date();
var ntime = d.getTime() + (((n * 24 | 0) * 3600 | 0) * 1000 | 0);
return new Date(ntime);
}
function renderTable() {
var e = document.getElementById('title');
e != null ? (e.innerHTML = trimIndent('\n <h1>Kotlin VS. JavaScript<\/h1>\n ')) : null;
}
function main(args) {
say();
getDate(2);
renderTable();
}
var package$demo = _.demo || (_.demo = {});
package$demo.say = say;
package$demo.getDate_za3lpa$ = getDate;
package$demo.renderTable = renderTable;
package$demo.main_kand9s$ = main;
main([]);
Kotlin.defineModule('app', _);
return _;
}(typeof app === 'undefined' ? {} : app, kotlin);
//# sourceMappingURL=app.js.map
页面效果：
image.png
构建执行：gradle build
image.png
参考文档：
1.《Kotlin 极简教程》（陈光剑）第39页。
新书上架：《Spring Boot 开发实战》
— 基于 Kotlin + Gradle + Spring Boot 2.0 的企业级服务端开发实战
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