{"id":34450,"date":"2020-01-14T16:22:21","date_gmt":"2020-01-14T08:22:21","guid":{"rendered":"https:\/\/blog.jetbrains.com\/cn\/?p=504"},"modified":"2020-02-27T18:49:44","modified_gmt":"2020-02-27T10:49:44","slug":"kotlin-1-4","status":"publish","type":"post","link":"https:\/\/blog.jetbrains.com\/zh-hans\/2020\/01\/14\/kotlin-1-4\/","title":{"rendered":"Kotlin 1.4 \u548c\u672a\u6765\u503c\u5f97\u671f\u5f85\u7684\u5730\u65b9"},"content":{"rendered":"\u5728 KotlinConf \u7684\u4e3b\u9898\u6f14\u8bb2\u4e2d\uff0cAndrey \u5f3a\u8c03\u4e86\u6211\u4eec\u5bf9 Kotlin \u5f53\u524d\u5173\u6ce8\u9886\u57df\u7684\u6218\u7565\u89c2\u70b9\uff0c\u4ee5\u53ca\u6211\u4eec\u5c06\u660e\u5e74\u53d1\u5e03\u7684 Kotlin 1.4 \u8ba1\u5212\u3002\r\n\u5728\u4e0b\u9762\u89c2\u770b\u6574\u4e2a\u4e3b\u9898\u6f14\u8bb2\r\n[embed]https:\/\/youtu.be\/0xKTM0A8gdI[\/embed]\r\n\u6211\u4eec\u7684\u613f\u666f\u662f\u8ba9 Kotlin 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\u56e2\u961f\u4e00\u8d77\u63d0\u9ad8\u4e86 Gradle \u811a\u672c\u7684\u8fd0\u884c\u901f\u5ea6\u3002Kotlin 1.3.60\uff0cAndroid Studio \u4e2d\u7684 Gradle Import \u5927\u7ea6\u662f Kotlin 1.3.10 \u7684 2.5 \u500d\uff0c\u5e76\u4e14\u5185\u5b58\u51cf\u5c11\u4e86\u7ea6 75\uff05\uff1a\r\n\r\n\u6b64\u5916\uff0c\u52a0\u8f7d\u00a0build.gradle.kts\u00a0\u51e0\u4e4e\u4e0d\u9700\u8981\u5360\u7528 CPU\uff01\u800c\u4e14\uff0c\u5728\u5f00\u53d1\u6a21\u5f0f\u4e0b\u7f16\u8bd1 Kotlin \/ Native \u7684\u901f\u5ea6\u4e0e\u4f7f\u7528\u4ee3\u7801\u7f13\u5b58\u7684\u901f\u5ea6\u76f8\u6bd4\u5feb\u4e86 2 \u500d\u3002\r\n\u6211\u4eec\u77e5\u9053\u6784\u5efa\u901f\u5ea6\u901a\u5e38\u662f\u6211\u4eec\u7528\u6237\u6700\u5173\u5fc3\u7684\u95ee\u9898\uff0c\u6211\u4eec\u6b63\u5728\u4e0d\u65ad\u6539\u8fdb\u5de5\u5177\u94fe\u4ee5\u89e3\u51b3\u6b64\u95ee\u9898\u3002\u4f46\u662f\u9010\u6b65\u6539\u8fdb\u8ddf\u4e0d\u4e0a\u751f\u4ea7\u4ee3\u7801\u5e93\u7684\u81ea\u7136\u589e\u957f\uff1a\u5c3d\u7ba1\u6211\u4eec\u52a0\u5feb\u4e86\u7f16\u8bd1\u901f\u5ea6\uff0c\u4f46\u7528\u6237\u7f16\u5199\u4e86\u66f4\u591a\u7684\u4ee3\u7801\uff0c\u4f7f\u603b\u4f53\u6784\u5efa\u65f6\u95f4\u8fd8\u4e0d\u591f\u77ed\u3002\u5f88\u660e\u663e\u7684\uff0c\u6211\u4eec\u9700\u8981\u91cd\u65b0\u5b9e\u73b0\u7f16\u8bd1\u5668\u4ee5\u4f7f\u5176\u66f4\u5feb\u901f\u3002\r\n\r\n\u65b0\u7684\u7f16\u8bd1\u5668\r\n\u65b0\u7f16\u8bd1\u5668\u5b9e\u73b0\u7684\u76ee\u6807\u662f\u53d8\u5f97\u66f4\u5feb\u901f\u3001\u7edf\u4e00 Kotlin \u652f\u6301\u7684\u6240\u6709\u5e73\u53f0\uff0c\u5e76\u63d0\u4f9b\u7528\u4e8e\u7f16\u8bd1\u5668\u6269\u5c55\u7684 API\u3002\u8fd9\u5c06\u662f\u4e00\u9879\u591a\u5e74\u7684\u5de5\u4f5c\uff0c\u4e0d\u8fc7\u6211\u4eec\u5df2\u5f00\u59cb\u597d\u4e00\u9635\u5b50\u4e86\uff0c\u56e0\u6b64\u65b0\u5b9e\u73b0\u7684\u67d0\u4e9b\u90e8\u5206\u5c06\u5728 1.4 \u4e2d\u53d1\u5e03\uff0c\u53ef\u8ba9\u8fd9\u4e2a\u8fc7\u7a0b\u53d8\u5f97\u66f4\u52a0\u5e73\u987a\u3002\u6709\u4e9b\u529f\u80fd\u4e5f\u5df2\u7ecf\u53d1\u5e03\u4e86\uff1b \u4f8b\u5982\uff0c\u5982\u679c\u60a8\u5c1d\u8bd5\u4e86\u7528\u4e8e\u7c7b\u578b\u63a8\u7406\u7684\u65b0\u7b97\u6cd5\uff0c\u5b83\u662f\u65b0\u7f16\u8bd1\u5668\u7684\u4e00\u90e8\u5206\u3002\u5176\u4ed6\u90e8\u5206\u7684\u5904\u7406\u65b9\u6cd5\u76f8\u540c\u3002 \u4e5f\u5c31\u662f\u8bf4\uff0c\u4e24\u79cd\u7248\u672c\u90fd\u5c06\u5728\u4e00\u6bb5\u65f6\u95f4\u5185\u53ef\u7528\uff0c\u65e7\u7248\u672c\u548c\u65b0\u7248\u672c\u90fd\u5c06\u5904\u4e8e\u5b9e\u9a8c\u6a21\u5f0f\uff1b \u5f53\u65b0\u7684\u7a33\u5b9a\u540e\uff0c\u5b83\u5c06\u6210\u4e3a\u9ed8\u8ba4\u7248\u672c\u3002\r\n\r\n\u65b0\u7684\u524d\u7aef\uff08front-end\uff09\u52a0\u901f\r\n\u6211\u4eec\u671f\u671b\u65b0\u7f16\u8bd1\u5668\u63d0\u9ad8\u7684\u901f\u5ea6\u5c06\u6765\u81ea\u65b0\u7684\u524d\u7aef\u5b9e\u73b0\u3002\r\n\u4e3a\u4e86\u63d0\u4f9b\u4e00\u4e9b\u80cc\u666f\u4fe1\u606f\uff0c\u53ef\u4ee5\u5c06\u7f16\u8bd1\u60f3\u6210\u5438\u6536\u6e90\u6587\u4ef6\u5e76\u5c06\u5176\u9010\u6b65\u8f6c\u6362\u4e3a\u53ef\u6267\u884c\u4ee3\u7801\u7684\u7ba1\u9053\u3002\u6b64\u7ba1\u9053\u7684\u7b2c\u4e00\u6b65\u4fd7\u79f0\u4e3a\u7f16\u8bd1\u5668\u7684\u524d\u7aef\u3002\u5b83\u89e3\u6790\u4ee3\u7801\u548c\u547d\u540d\u3001\u6267\u884c\u7c7b\u578b\u68c0\u67e5\u7b49\u3002\u6b64\u7f16\u8bd1\u5668\u7684\u8fd9\u4e00\u90e8\u5206\u4e5f\u53ef\u4ee5\u5728 IDE \u4e2d\u4f7f\u7528\uff0c\u6765\u9ad8\u4eae\u663e\u793a\u8bed\u6cd5\u9519\u8bef\u3001\u5bfc\u822a\u5230\u5b9a\u4e49\u5e76\u641c\u7d22\u9879\u76ee\u4e2d\u7684\u7b26\u53f7\u7528\u6cd5\u3002\u8fd9\u662f\u00a0kotlinc\u00a0\u5982\u4eca\u82b1\u8d39\u6700\u591a\u65f6\u95f4\u7684\u6b65\u9aa4\uff0c\u56e0\u6b64\u6211\u4eec\u5e0c\u671b\u4f7f\u5176\u66f4\u5feb\u3002\r\n\u5f53\u524d\u7684\u5b9e\u73b0\u5c1a\u672a\u5b8c\u6210\uff0c\u5e76\u4e14\u4e0d\u4f1a\u5728 1.4 \u4e2d\u5230\u6765\u3002 \u4f46\u662f\uff0c\u5927\u591a\u8017\u65f6\u7684\u5de5\u4f5c\u90fd\u662f\u7531\u5b83\u5b8c\u6210\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u9884\u671f\u63d0\u901f\u7684\u6548\u679c\u3002\u6211\u4eec\u7684\u57fa\u51c6\u6d4b\u8bd5\uff08\u7f16\u8bd1 YouTrack \u548c Kotlin \u7f16\u8bd1\u5668\u672c\u8eab\uff09\u8868\u660e\uff0c\u65b0\u524d\u7aef\u7684\u901f\u5ea6\u7ea6\u4e3a\u73b0\u6709\u524d\u7aef\u5feb 4.5 \u500d\u3002\r\n\r\n\u7edf\u4e00\u7684\u540e\u7aef\u548c\u53ef\u6269\u5c55\u6027\r\n\u5728\u524d\u7aef\u5b8c\u6210\u5bf9\u4ee3\u7801\u7684\u5206\u6790\u4e4b\u540e\uff0c\u540e\u7aef\u5c06\u751f\u6210\u53ef\u6267\u884c\u6587\u4ef6\u3002\u6211\u4eec\u6709\u4e09\u4e2a\u540e\u7aef\uff1aKotlin \/ JVM\uff0cKotlin \/ JS \u548c Kotlin \/ Native\u3002\u524d\u4e24\u4e2a\u4ee5\u5f80\u662f\u72ec\u7acb\u7f16\u5199\u7684\uff0c\u6ca1\u6709\u4ee3\u7801\u5171\u4eab\u3002\u5f53\u6211\u4eec\u542f\u52a8 Kotlin \/ Native \u65f6\uff0c\u5b83\u662f\u57fa\u4e8e\u56f4\u7ed5 Kotlin \u4ee3\u7801\u5185\u90e8\u8868\u793a\uff08internal representation\uff09\u6784\u5efa\u7684\u65b0\u57fa\u7840\u67b6\u6784\u7684\uff0c\u8be5\u529f\u80fd\u5177\u6709\u4e0e\u865a\u62df\u673a\u4e2d\u7684\u5b57\u8282\u7801\u7c7b\u4f3c\u7684\u529f\u80fd\u3002\u73b0\u5728\uff0c\u6211\u4eec\u5c06\u5176\u4ed6\u4e24\u4e2a\u540e\u7aef\u8fc1\u79fb\u5230\u540c\u4e00\u5185\u90e8\u8868\u793a\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5c06\u5171\u4eab\u8bb8\u591a\u540e\u7aef\u903b\u8f91\u5e76\u62e5\u6709\u7edf\u4e00\u7684\u7ba1\u9053\uff0c\u4ee5\u5141\u8bb8\u5bf9\u6240\u6709\u76ee\u6807\u4ec5\u6267\u884c\u4e00\u6b21\u5927\u591a\u6570\u529f\u80fd\u3001\u4f18\u5316\u548c\u9519\u8bef\u4fee\u590d\u3002\r\n\u6211\u4eec\u5c06\u9010\u6b65\u8fc1\u79fb\u5230\u65b0\u7684\u540e\u7aef\uff0c\u53ef\u662f\u5728 1.4 \u4e2d\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4e0d\u592a\u53ef\u80fd\u542f\u7528\u5b83\u4eec\uff0c\u4f46\u7528\u6237\u5c06\u80fd\u591f\u9009\u62e9\u660e\u786e\u4f7f\u7528\u5b83\u4eec\u3002\r\n\u901a\u7528\u7684\u540e\u7aef\u57fa\u7840\u7ed3\u6784\u4e3a\u8de8\u5e73\u53f0\u7f16\u8bd1\u5668\u6269\u5c55\u6253\u5f00\u4e86\u5927\u95e8\u3002\u53ef\u4ee5\u5728\u8fd9\u7ba1\u9053\u4e2d\u6dfb\u52a0\u4e00\u4e9b\u81ea\u5b9a\u4e49\u5904\u7406\u548c\/\u6216\u8f6c\u6362\uff0c\u8fd9\u4e9b\u5904\u7406\u548c\u8f6c\u6362\u5c06\u81ea\u52a8\u9002\u7528\u4e8e\u6240\u6709\u76ee\u6807\u3002\u5728 1.4 \u4e2d\uff0c\u6211\u4eec\u4e0d\u63d0\u4f9b\u7528\u4e8e\u6b64\u7c7b\u6269\u5c55\u7684\u516c\u5f00 API\uff08\u8be5 API \u7a0d\u540e\u5c06\u88ab\u7a33\u5b9a\uff09\uff0c\u4f46\u6211\u4eec\u6b63\u5728\u4e0e\u5408\u4f5c\u4f19\u4f34 \uff08\u5176\u4e2d\u5305\u62ec\u5df2\u7ecf\u6784\u5efa\u5176\u7f16\u8bd1\u5668\u63d2\u4ef6\u7684\u00a0JetPack Compose\u00a0\uff09\u7d27\u5bc6\u5408\u4f5c\u3002\r\n\r\n\u4ecb\u7ecd KLib\uff1aKotlin \u5e93\u683c\u5f0f\r\n\u4e3a\u4e86\u5728 Kotlin \u4e2d\u6784\u5efa\u8de8\u5e73\u53f0\u5e93\u5e76\u5c06\u5176\u53d1\u5e03\u4ee5\u4f7f\u5ba2\u6237\u53ef\u4ee5\u4f9d\u8d56\u5b83\uff0c\u9700\u8981\u4e00\u79cd\u5728\u4efb\u4f55\u5e73\u53f0\u4e0a\u5747\u80fd\u6b63\u5e38\u5de5\u4f5c\u7684\u53d1\u884c\u683c\u5f0f\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u6211\u4eec\u5f15\u5165 KLib \u7684\u539f\u56e0\uff1aKLib \u662f Kotlin \u8de8\u5e73\u53f0\u7684\u5e93\u683c\u5f0f\u3002KLib \u6587\u4ef6\u5305\u542b\u5e8f\u5217\u5316\u7684\u5185\u90e8\u8868\u793a\u3002\u60a8\u7684\u4ee3\u7801\u53ef\u80fd\u4f1a\u5c06\u5176\u6dfb\u52a0\u4e3a\u4f9d\u8d56\u9879\uff0c\u5e76\u4e14\u7f16\u8bd1\u5668\u540e\u7aef\u5c06\u9009\u62e9\u5b83\u5e76\u4e3a\u7ed9\u5b9a\u5e73\u53f0\u751f\u6210\u53ef\u6267\u884c\u4ee3\u7801\u3002\u4e0e\u5b57\u8282\u7801\u7684\u7c7b\u6bd4\u4ecd\u7136\u5b58\u5728\uff1a\u53ef\u4ee5\u50cf JVM \u5b57\u8282\u7801\u4e00\u6837\u5206\u6790\u548c\u8f6c\u6362 KLib\u3002\u5bf9\u5e8f\u5217\u5316\u5185\u90e8\u8868\u793a\u8fdb\u884c\u7684\u4efb\u4f55\u8f6c\u6362\u90fd\u4f1a\u5f71\u54cd KLib \u5c06\u7528\u4e8e\u7684\u4efb\u4f55\u5e73\u53f0\u3002\r\n\u5b9e\u9645\u4e0a\uff0cKotlin \/ Native \u5df2\u7ecf\u4f7f\u7528 KLibs \u683c\u5f0f\u5206\u53d1 Kotlin \u672c\u673a\u5e93\u5df2\u6709\u76f8\u5f53\u957f\u7684\u4e00\u6bb5\u65f6\u95f4\u4e86\uff0c\u73b0\u5728\u6211\u4eec\u6b63\u5728\u6269\u5c55\u8be5\u683c\u5f0f\u4ee5\u652f\u6301\u5176\u4ed6\u540e\u7aef\u548c\u8de8\u5e73\u53f0\u5e93\u3002\u8be5\u683c\u5f0f\u5c06\u5728 1.4 \u4e2d\u8fdb\u884c\u5b9e\u9a8c\uff0c\u6211\u4eec\u5c06\u5728\u4ee5\u540e\u7684\u7248\u672c\u4e2d\u4e3a\u5176\u63d0\u4f9b\u7a33\u5b9a\u7684 ABI\u3002\r\n\r\n\u66f4\u591a\u8de8\u5e73\u53f0\u65b0\u95fb\r\n\u5728 Android Studio \u4e2d\u8fd0\u884c iOS \u4ee3\u7801\r\n\u6211\u4eec\u6b63\u5728\u5f00\u53d1\u9002\u7528\u4e8e Android Studio \u7684\u63d2\u4ef6\uff0c\u8be5\u63d2\u4ef6\u5c06\u80fd\u591f\u5728 iOS \u8bbe\u5907\u548c\u6a21\u62df\u5668\u4e0a\u8fd0\u884c\u3001\u6d4b\u8bd5\u548c\u8c03\u8bd5 Kotlin \u4ee3\u7801\u3002\u8be5\u63d2\u4ef6\u4f7f\u7528\u7684\u662f IntelliJ \u4e13\u6709\u4ee3\u7801\uff0c\u56e0\u6b64\u5c06\u662f\u5c01\u95ed\u6e90\u4ee3\u7801\u3002\u5b83\u4e0d\u4f1a\u5e26\u6765\u5bf9 Objective-C \u6216 Swift \u7684\u8bed\u8a00\u652f\u6301\uff0c\u5e76\u4e14\u67d0\u4e9b\u64cd\u4f5c\uff08\u4f8b\u5982\u90e8\u7f72\u5230 AppStore \u53ef\u80fd\u9700\u8981\u8fd0\u884c Xcode\uff09\uff0c\u4f46\u662f\u60a8\u5bf9 Kotlin \u4ee3\u7801\u6240\u505a\u7684\u4efb\u4f55\u64cd\u4f5c\u90fd\u53ef\u4ee5\u5728\u5b89\u88c5\u4e86\u65b0\u63d2\u4ef6\u7684 Android Studio \u4e2d\u4f7f\u7528\u3002\u6211\u4eec\u5e0c\u671b\u5728 2020 \u5e74\u53d1\u5e03\u6b64\u63d2\u4ef6\u7684\u9884\u89c8\u3002\r\n\r\nKotlin \/ Native \u8fd0\u884c\u65f6\u6539\u8fdb\r\n\u9664\u4e86 Linux\u3001Windows\u3001macOS \u548c iOS\uff0cKotlin \/ Native \u73b0\u5728\u8fd8\u53ef\u4ee5\u5728 watchOS \u548c tvOS \u4e0a\u8fd0\u884c\uff0c\u56e0\u6b64\u51e0\u4e4e\u4efb\u4f55\u8bbe\u5907\u90fd\u53ef\u4ee5\u8fd0\u884c Kotlin\u3002\u6211\u4eec\u8fd8\u81f4\u529b\u4e8e Kotlin \/ Native \u7684\u8fd0\u884c\u65f6\u6027\u80fd\uff0c\u4ee5\u4f7f iOS Kotlin \u7a0b\u5e8f\u8fd0\u884c\u5f97\u66f4\u5feb\u3002\r\n\r\n\u6838\u5fc3\u5e93\r\nKotlin \u6838\u5fc3\u5e93\u53ef\u5728\u6240\u6709\u5e73\u53f0\u4e0a\u8fd0\u884c\u3002\u5176\u4e2d\u5305\u62ec\u5904\u7406\u6240\u6709\u57fa\u672c\u7c7b\u578b\u548c\u96c6\u5408\u7684\u00a0kotlin-stdlib\u00a0\u3001\u00a0kotlinx.coroutines\u3001\u00a0kotlinx.serialization\u00a0\u548c\u00a0kotlinx.io\u00a0\u3002\u5728\u8de8\u5e73\u53f0\u4e16\u754c\u4e2d\u786e\u5b9e\u9700\u8981\u5bf9\u65e5\u671f\u7684\u652f\u6301\uff0c\u8fd9\u5c31\u662f\u6211\u4eec\u6b63\u5728\u52aa\u529b\u7684\u5de5\u4f5c\uff1a\u5b9e\u9a8c\u6027 Durations \u5df2\u7ecf\u6dfb\u52a0\u5230 stdlib \u4e2d\uff0c\u5e76\u4e14 DateTime \u652f\u6301\u6b63\u5728\u8fdb\u884c\u4e2d\u3002\r\nKotlin \u5e93\u7684\u53e6\u4e00\u4e2a\u91cd\u8981\u8865\u5145\u662f\u00a0Flow\uff0c\u5b83\u662f\u57fa\u4e8e\u534f\u540c\u7a0b\u5e8f\u7684 Reactive Streams \u5b9e\u73b0\u3002Flow \u975e\u5e38\u9002\u5408\u5904\u7406\u6570\u636e\u6d41\uff0c\u5e76\u4e14\u5229\u7528\u4e86 Kotlin \u7684\u5f3a\u5927\u529b\u91cf\u3002\u9664\u4e86\u7b26\u5408\u4eba\u4f53\u5de5\u7a0b\u5b66\uff0cFlow \u8fd8\u5e26\u6765\u4e86\u989d\u5916\u7684\u901f\u5ea6\u3002\u5728\u4e00\u4e9b\u57fa\u51c6\u6d4b\u8bd5\u4e0a\uff0c\u5b83\u7684\u901f\u5ea6\u51e0\u4e4e\u662f\u73b0\u6709\u6d41\u884c\u7684 Reactive Streams \u5feb 2 \u500d\u7684\u5b9e\u73b0\u3002\r\n\r\n\u5bf9\u4e8e\u5e93\u4f5c\u8005\r\n\u7531\u4e8e\u521b\u5efa\u65b0\u5e93\u5bf9\u4e8e Kotlin \u751f\u6001\u7cfb\u7edf\u81f3\u5173\u91cd\u8981\uff0c\u56e0\u6b64\u6211\u4eec\u5c06\u4e0d\u65ad\u6539\u5584\u5e93\u4f5c\u8005\u7684\u4f53\u9a8c\u3002\u65b0\u7684\u5e93\u521b\u4f5c\u6a21\u5f0f\u5c06\u4ee5\u6700\u9002\u5408\u7a33\u5b9a API \u7684\u65b9\u5f0f\u5e2e\u52a9\u60a8\u5851\u9020\u4ee3\u7801\u3002\u53e6\u5916\uff0c\u6211\u4eec\u5c06\u53d1\u5e03 Dokka 1.0 \u4ee5\u652f\u6301\u6240\u6709\u5e73\u53f0\u7684\u6587\u6863\u751f\u6210\u3002\r\n\r\n\u8de8\u5e73\u53f0 web\r\n\u8de8\u5e73\u53f0\u5171\u4eab\u4ee3\u7801\u5bf9\u79fb\u52a8\u8bbe\u5907\u975e\u5e38\u6709\u7528\uff0c\u800c\u5bf9 Web \u5ba2\u6237\u7aef\u4e5f\u975e\u5e38\u6709\u7528\uff1a\u53ef\u4ee5\u4e0e\u670d\u52a1\u5668\u548c \/ \u6216\u79fb\u52a8\u5e94\u7528\u7a0b\u5e8f\u5171\u4eab\u5f88\u591a\u5185\u5bb9\u3002\u6211\u4eec\u5bf9 Kotlin \/ JS \u5de5\u5177\u7684\u6295\u8d44\u8d8a\u6765\u8d8a\u591a\uff0c\u73b0\u5728\u53ef\u4ee5\u8fdb\u884c\u975e\u5e38\u5feb\u901f\u7684\u5f00\u53d1\u5f80\u8fd4\uff0c\u4ece\u66f4\u6539 Kotlin \u4ee3\u7801\u5230\u5728\u6d4f\u89c8\u5668\u4e2d\u67e5\u770b\u7ed3\u679c\uff1a\r\n\r\n\u6211\u4eec\u8fd8\u6539\u8fdb\u4e86 JS \u4e92\u64cd\u4f5c\uff0c\u73b0\u5728\u60a8\u53ef\u4ee5\u5c06 NPM \u4f9d\u8d56\u9879\u9644\u52a0\u5230 Kotlin \u9879\u76ee\uff0c\u5e76\u4e14\u4efb\u4f55\u00a0.d.ts\u00a0\u7c7b\u578b\u5b9a\u4e49\u90fd\u5c06\u7531 Kotlin \u5de5\u5177\u94fe\u81ea\u52a8\u83b7\u53d6\u3002\u65b0\u7684\u57fa\u4e8e\u5185\u90e8\u8868\u793a\u7684\u540e\u7aef\u8fd8\u5c06\u5e26\u6765\u4e8c\u8fdb\u5236\u5927\u5c0f\u7684\u91cd\u5927\u6539\u8fdb\u3002\u7f16\u8bd1\u540e\u7684 JS \u6587\u4ef6\u53ef\u4ee5\u53d8\u6210\u5176\u5f53\u524d\u5927\u5c0f\u7684\u4e00\u534a\u3002\r\n\r\n\u65b0\u7684\u8bed\u8a00\u529f\u80fd\uff1a\r\nKotlin 1.4 \u5c06\u63d0\u4f9b\u4e00\u4e9b\u65b0\u7684\u8bed\u8a00\u529f\u80fd\u3002\r\n\r\nKotlin \u7c7b\u7684 SAM \u8f6c\u6362\r\n\u793e\u533a\u5df2\u8981\u6c42\u6211\u4eec\u5f15\u5165\u5bf9 Kotlin \u7c7b\uff08\u00a0KT-7770\u00a0\uff09\u7684 SAM \u8f6c\u6362\u7684\u652f\u6301\u3002\u5982\u679c\u4ec5\u5c06\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u7684\u63a5\u53e3\u6216\u7c7b\u9884\u8ba1\u4f5c\u4e3a\u53c2\u6570\uff0c\u5219\u5c06 lambda \u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u65f6\uff0c\u5c06\u5e94\u7528 SAM \u8f6c\u6362\u3002\u7136\u540e\uff0c\u7f16\u8bd1\u5668\u81ea\u52a8\u5c06 lambda \u8f6c\u6362\u4e3a\u5b9e\u73b0\u62bd\u8c61\u6210\u5458\u51fd\u6570\u7684\u7c7b\u7684\u5b9e\u4f8b\u3002\r\nSAM \u8f6c\u6362\u5f53\u524d\u4ec5\u9002\u7528\u4e8e Java \u63a5\u53e3\u548c\u62bd\u8c61\u7c7b\u3002\u8be5\u8bbe\u8ba1\u80cc\u540e\u7684\u6700\u521d\u60f3\u6cd5\u662f\u9488\u5bf9\u6b64\u7c7b\u7528\u4f8b\u660e\u786e\u4f7f\u7528\u51fd\u6570\u7c7b\u578b\u3002\u7136\u800c\uff0c\u4e8b\u5b9e\u8bc1\u660e\uff0c\u51fd\u6570\u7c7b\u578b\u548c\u7c7b\u578b\u522b\u540d\u5e76\u4e0d\u80fd\u6db5\u76d6\u6240\u6709\u7528\u4f8b\uff0c\u5f00\u53d1\u8005\u5e38\u5e38\u4e0d\u5f97\u4e0d\u4ec5\u5728 Java \u4e2d\u4fdd\u7559\u63a5\u53e3\u624d\u80fd\u5bf9\u5176\u8fdb\u884c SAM \u8f6c\u6362\u3002\r\n\u4e0e Java \u4e0d\u540c\uff0cKotlin \u4e0d\u5141\u8bb8\u4f7f\u7528\u4e00\u79cd\u62bd\u8c61\u65b9\u6cd5\u5bf9\u6bcf\u4e2a\u63a5\u53e3\u8fdb\u884c SAM \u8f6c\u6362\u3002\u6211\u4eec\u8ba4\u4e3a\uff0c\u4f7f\u63a5\u53e3\u9002\u7528\u4e8e SAM \u8f6c\u6362\u7684\u610f\u56fe\u5e94\u8be5\u660e\u786e\u3002\u56e0\u6b64\uff0c\u8981\u5b9a\u4e49 SAM \u63a5\u53e3\uff0c\u60a8\u9700\u8981\u4f7f\u7528\u00a0fun\u00a0\u5173\u952e\u5b57\u6807\u8bb0\u4e00\u4e2a\u63a5\u53e3\uff0c\u4ee5\u5f3a\u8c03\u5b83\u53ef\u4ee5\u7528\u4f5c\u529f\u80fd\u6027\u63a5\u53e3\uff1a\r\n\r\nfun interface Action {\r\n    fun run()\r\n}\r\n\r\nfun runAction(a: Action) = a.run()\r\n\r\nfun main() {\r\n    runAction {\r\n        println(\"Hello, KotlinConf!\")\r\n    }\r\n}\r\n\u8bf7\u6ce8\u610f\uff0c\u4ec5\u5728\u65b0\u7684\u7c7b\u578b\u63a8\u65ad\u7b97\u6cd5\u4e2d\u652f\u6301\u4f20\u9012 lambda \u800c\u4e0d\u662f\u00a0fun \u63a5\u53e3\u3002\r\n\r\n\u6df7\u5408\u547d\u540d\u548c\u4f4d\u7f6e\u53c2\u6570\r\nKotlin \u7981\u6b62\u5c06\u5e26\u6709\u663e\u5f0f\u540d\u79f0\u7684\u53c2\u6570\uff08\u201c\u547d\u540d\u201d\uff09\u548c\u4e0d\u5e26\u540d\u79f0\u7684\u5e38\u89c4\u53c2\u6570\uff08\u201c\u4f4d\u7f6e\u201d\uff09\u6df7\u5408\u4f7f\u7528\uff0c\u9664\u975e\u4ec5\u5c06\u547d\u540d\u53c2\u6570\u653e\u5728\u6240\u6709\u4f4d\u7f6e\u53c2\u6570\u4e4b\u540e\u3002\u4f46\u662f\uff0c\u5728\u4e00\u79cd\u60c5\u51b5\u4e0b\uff0c\u8fd9\u786e\u5b9e\u5f88\u70e6\u4eba\uff1a\u5f53\u6240\u6709\u53c2\u6570\u90fd\u4fdd\u6301\u5728\u6b63\u786e\u7684\u4f4d\u7f6e\u800c\u60a8\u60f3\u4e3a\u4e2d\u95f4\u7684\u4e00\u4e2a\u53c2\u6570\u6307\u5b9a\u540d\u79f0\u65f6\u3002Kotlin 1.4 \u5c06\u89e3\u51b3\u6b64\u95ee\u9898\uff0c\u56e0\u6b64\u60a8\u5c06\u80fd\u591f\u7f16\u5199\u5982\u4e0b\u4ee3\u7801\uff1a\r\n\r\nfun f(a: Int, b: Int, c: Int) {}\r\n\r\nfun main() {\r\n    f(1, b = 2, 3)\r\n}\r\n\u4f18\u5316\u7684\u59d4\u6258\u5c5e\u6027\r\n\u6211\u4eec\u5c06\u6539\u8fdb\u00a0lazy\u00a0\u5c5e\u6027\u548c\u5176\u4ed6\u4e00\u4e9b\u59d4\u6258\u5c5e\u6027\u7684\u7f16\u8bd1\u65b9\u5f0f\u3002\r\n\u901a\u5e38\uff0c\u59d4\u6258\u5c5e\u6027\u53ef\u4ee5\u8bbf\u95ee\u76f8\u5e94\u7684\u00a0KProperty\u00a0\u53cd\u5c04\u5bf9\u8c61\u3002\u4f8b\u5982\uff0c\u5f53\u4f7f\u7528\u00a0Delegates.observable\u00a0\u65f6\uff0c\u53ef\u4ee5\u663e\u793a\u6709\u5173\u5df2\u4fee\u6539\u5c5e\u6027\u7684\u4fe1\u606f\uff1a\r\n\r\nimport kotlin.properties.Delegates\r\n\r\nclass MyClass {\r\n    var myProp: String by Delegates.observable(\"<no name>\") {\r\n        kProperty, oldValue, newValue ->\r\n        println(\"${kProperty.name}: $oldValue -> $newValue\")\r\n    }\r\n}\r\n\r\nfun main() {\r\n    val user = MyClass()\r\n    user.myProp = \"first\"\r\n    user.myProp = \"second\"\r\n}\r\n\u4e3a\u4e86\u4f7f\u4e4b\u6210\u4e3a\u53ef\u80fd\uff0cKotlin \u7f16\u8bd1\u5668\u4f1a\u751f\u6210\u4e00\u4e2a\u9644\u52a0\u7684\u8bed\u6cd5\u6210\u5458\u5c5e\u6027\uff0c\u5373\u4e00\u4e2a\u5b58\u50a8\u6240\u6709\u00a0KProperty\u00a0\u5bf9\u8c61\u7684\u6570\u7ec4\uff0c\u8fd9\u4e9b\u5bf9\u8c61\u8868\u793a\u5728\u7c7b\u5185\u90e8\u4f7f\u7528\u7684\u59d4\u6258\u5c5e\u6027\uff1a\r\n\r\n>>> javap MyClass\r\n\r\npublic final class MyClass {\r\n    static final kotlin.reflect.KProperty[] $$delegatedProperties;\r\n    ...\r\n}\r\n\u4f46\u662f\uff0c\u67d0\u4e9b\u59d4\u6258\u5c5e\u6027\u4e0d\u4f1a\u4ee5\u4efb\u4f55\u65b9\u5f0f\u4f7f\u7528\u00a0KProperty\u3002\u5bf9\u4e8e\u4ed6\u4eec\u6765\u8bf4\uff0c\u5728\u00a0$$delegatedProperties\u00a0\u4e2d\u751f\u6210\u5bf9\u8c61\u662f\u6b21\u4f18\u7684\u3002Kotlin 1.4 \u7248\u672c\u5c06\u4f18\u5316\u8fd9\u79cd\u60c5\u51b5\u3002\u5982\u679c\u59d4\u6258\u5c5e\u6027\u8fd0\u7b97\u7b26\u662f\u00a0inline\uff0c\u5e76\u4e14\u672a\u4f7f\u7528\u00a0KProperty\u00a0\u53c2\u6570\uff0c\u5219\u4e0d\u4f1a\u751f\u6210\u76f8\u5e94\u7684\u53cd\u5c04\u5bf9\u8c61\u3002\u6700\u51fa\u8272\u7684\u793a\u4f8b\u662f\u00a0lazy\u00a0\u5c5e\u6027\u3002lazy\u00a0\u5c5e\u6027\u7684\u00a0getValue\u00a0\u5b9e\u73b0\u662f\u00a0inline\uff0c\u5e76\u4e14\u4e0d\u4f7f\u7528\u00a0KProperty\u00a0\u53c2\u6570\uff1a\r\n\r\ninline operator fun <T> Lazy<T>.getValue(thisRef: Any?, property: KProperty<*>): T = value\r\n\u4ece Kotlin 1.4 \u5f00\u59cb\uff0c\u5f53\u60a8\u5b9a\u4e49\u00a0lazy\u5c5e\u6027\u65f6\uff0c\u5c06\u4e0d\u4f1a\u751f\u6210\u76f8\u5e94\u7684\u00a0KProperty\u5b9e\u4f8b\u3002\u5982\u679c\u60a8\u5728\u7c7b\u4e2d\u4f7f\u7528\u7684\u552f\u4e00\u59d4\u6258\u5c5e\u6027\u662f\u00a0lazy\u5c5e\u6027\uff08\u4ee5\u53ca\u7b26\u5408\u6b64\u4f18\u5316\u7684\u5176\u4ed6\u5c5e\u6027\uff09\uff0c\u5219\u4e0d\u4f1a\u4e3a\u7c7b\u751f\u6210\u6574\u4e2a\u00a0$$delegatedProperties\u00a0\u6570\u7ec4\uff1a\r\n\r\nclass MyOtherClass {\r\n    val lazyProp by lazy { 42 }\r\n}\r\n\r\n>>> javap MyOtherClass\r\npublic final class MyOtherClass {\r\n    \/\/ no longer generated:\r\n    static final kotlin.reflect.KProperty[] $$delegatedProperties; \r\n    ...\r\n}\r\n \r\n\u5c3e\u968f\u9017\u53f7\r\n\u8fd9\u4e2a\u5fae\u5c0f\u7684\u8bed\u6cd5\u53d8\u5316\u539f\u6765\u662f\u975e\u5e38\u65b9\u4fbf\u7684\uff01\u60a8\u53ef\u4ee5\u5728\u53c2\u6570\u5217\u8868\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u4e4b\u540e\u653e\u7f6e\u4e00\u4e2a\u9644\u52a0\u7684\u5c3e\u968f\u9017\u53f7\u3002\u7136\u540e\uff0c\u60a8\u53ef\u4ee5\u4ea4\u6362\u884c\u6216\u6dfb\u52a0\u65b0\u53c2\u6570\uff0c\u800c\u4e0d\u5fc5\u6dfb\u52a0\u6216\u5220\u9664\u4e22\u5931\u7684\u9017\u53f7\u3002\r\n\r\n\u5176\u4ed6\u4e3b\u8981\u53d8\u5316\r\nKotlin 1.3.40 \u4e2d\u5f15\u5165\u4e86\u7684\u6709\u7528\u7684\u00a0typeof\u00a0\u51fd\u6570\u5c06\u53d8\u5f97\u7a33\u5b9a\u5e76\u5728\u6240\u6709\u5e73\u53f0\u4e0a\u5f97\u5230\u652f\u6301\u3002\r\n1.3.60 \u7248\u672c\u535a\u5ba2\u6587\u7ae0\u4e2d\u5df2\u7ecf\u63cf\u8ff0\u4e86\u4f7f\u60a8\u53ef\u4ee5\u5728\u00a0when\u00a0\u5185\u542f\u7528\u00a0break\u00a0\u548c\u00a0continue\u00a0\u7684\u529f\u80fd\u3002\r\n\r\n\u8c22\u8c22\uff01\r\n\u975e\u5e38\u611f\u8c22\u6240\u6709\u5c1d\u8bd5\u8fc7 Kotlin EAP \u548c\u5b9e\u9a8c\u6027\u529f\u80fd\u5e76\u63d0\u4f9b\u53cd\u9988\u7684\u4eba\u3002\u6211\u4eec\u6b63\u5728\u4e0e\u60a8\u4e00\u8d77\u5f00\u53d1 Kotlin \u8bed\u8a00\uff0c\u5e76\u6839\u636e\u60a8\u7684\u5b9d\u8d35\u610f\u89c1\u505a\u51fa\u8bb8\u591a\u8bbe\u8ba1\u51b3\u7b56\u3002\u4e0e\u793e\u533a\u4fdd\u6301\u8fd9\u79cd\u5feb\u901f\u6709\u6548\u7684\u53cd\u9988\u5faa\u73af\u5bf9\u786e\u4fdd Kotlin \u6210\u4e3a\u6700\u4f73\u72b6\u6001\u975e\u5e38\u91cd\u8981\uff01\r\n\u6211\u4eec\u975e\u5e38\u611f\u8c22\u793e\u533a\u4e2d\u6240\u6709\u4e0e Kotlin \u5171\u540c\u521b\u9020\u4e86\u8bb8\u591a\u4ee4\u4eba\u60ca\u5947\u7684\u4e8b\u7269\u7684\u6210\u5458\u3002\u8ba9\u6211\u4eec\u4e00\u8d77\u7ee7\u7eed Kotlin\uff01\r\n\u8bf7\u6ce8\u610f\uff0cIntelliJ IDEA \u548c Android Studio \u4e2d\u7684 Kotlin \u63d2\u4ef6\u4f1a\u6536\u96c6\u60a8\u4f7f\u7528\u5176\u529f\u80fd\u7684\u533f\u540d\u7edf\u8ba1\u4fe1\u606f\u3002\u6211\u4eec\u5e0c\u671b\u60a8\u9009\u62e9\u5206\u4eab\u8fd9\u4e9b\u7edf\u8ba1\u4fe1\u606f\uff0c\u56e0\u4e3a\u8fd9\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u4e86\u89e3\u6709\u6548\u7684\u529f\u80fd\u3001\u9020\u6210\u9ebb\u70e6\u7684\u95ee\u9898\u4ee5\u53ca\u6211\u4eec\u5e94\u5173\u6ce8\u7684\u6539\u8fdb\u91cd\u70b9\u3002","protected":false},"excerpt":{"rendered":"\u5728 KotlinConf \u7684\u4e3b\u9898\u6f14\u8bb2\u4e2d\uff0cAndrey \u5f3a\u8c03\u4e86\u6211\u4eec\u5bf9 Kotlin \u5f53\u524d\u5173\u6ce8\u9886\u57df\u7684\u6218\u7565\u89c2\u70b9\uff0c\u4ee5\u53ca\u6211\u4eec\u5c06\u660e\u5e74\u53d1\u5e03\u7684 Kotlin 1.4 \u8ba1\u5212\u3002\u5728\u4e0b\u9762\u89c2\u770b\u6574\u4e2a\u4e3b\u9898\u6f14\u8bb2\u6211\u4eec\u7684\u613f\u666f\u662f\u8ba9 Kotlin \u6210\u4e3a\u60a8\u6240\u6709\u5de5\u4f5c\u7684\u53ef\u9760\u4f34\u4fa3\uff0c\u5e76\u662f\u60a8\u6267\u884c\u4efb\u52a1\u7684\u9ed8\u8ba4\u8bed\u8a00\u9009\u62e9\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u5c06\u4f7f\u5b83\u5728\u6240\u6709\u5e73\u53f0\u4e0a\u5927\u653e\u5f02\u5f69\u3002\u6765\u81ea\u884c\u4e1a\u77e5\u540d\u516c\u53f8\u7684\u591a\u4e2a\u6848\u4f8b\u7814\u7a76\u8868\u660e\uff0c\u6211\u4eec\u5728\u8fd9\u4e00\u65b9\u5411\u4e0a\u53d6\u5f97\u4e86\u5f88\u597d\u7684\u8fdb\u5c55\u3002\u4e8e 2020","protected":false},"author":{"name":"Lei","link":"https:\/\/blog.jetbrains.com\/zh-hans\/author\/lei-zhaojetbrains-com"},"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[4847],"tags":[5320,6038],"cross-post-tag":[],"acf":[],"featured_image":null,"_links":{"self":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/posts\/34450"}],"collection":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/users\/814"},{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/users\/814"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/comments?post=34450"}],"version-history":[{"count":0,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/posts\/34450\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/media?parent=34450"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/categories?post=34450"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/tags?post=34450"},{"taxonomy":"cross-post-tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/cross-post-tag?post=34450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}