使用另一个文件的函数，不需要

如何解决使用另一个文件的函数，不需要

上下文：

我有 3 个文件， 01/31 14:41:30: Launching 'app' on OnePlus ONEPLUS A6003. $ adb shell am start -n "com.example.bottles/com.example.bottles.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Connected to process 31111 on device 'oneplus-oneplus_a6003-2beda810'. Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page. I/Perf: Connecting to perf service. I/example.bottle: [GL_OOM] ClampGrowthLimit 268435456 V/Font: Change font:2 Default family:android.graphics.Typeface@1b512b59 E/Perf: Fail to get file list com.example.bottles getFolderSize() : Exception_1 = java.lang.NullPointerException: Attempt to get length of null array Fail to get file list com.example.bottles E/Perf: getFolderSize() : Exception_1 = java.lang.NullPointerException: Attempt to get length of null array W/example.bottle: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist,reflection,allowed) W/example.bottle: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist,allowed) V/ViewRootImpl: The specified message queue synchronization barrier token has not been posted or has already been removed D/DecorView: onWindowFocusChangedFromViewRoot hasFocus: true,DecorView@45d1a26[MainActivity] I/AdrenoGLES: QUALCOMM build : 35556ba,I9ca166462c Build Date : 08/07/19 OpenGL ES Shader Compiler Version: EV031.27.02.00 Local Branch : Remote Branch : Remote Branch : Reconstruct Branch : Build Config : S P 8.0.8 AArch64 I/AdrenoGLES: PFP: 0x016ee187,ME: 0x00000000 W/Gralloc3: mapper 3.x is not supported D/: Successfully load libgui-plugin.so,this=0x798f030050 D/OnePlusJankManager: Chor uploadMDM JANK_TYPE_ONCE mViewTitle = com.example.bottles/com.example.bottles.MainActivity--- jank level = 1 D/AndroidRuntime: Shutting down VM E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.bottles,PID: 31111 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setonClickListener(android.view.View$OnClickListener)' on a null object reference at com.example.bottles.RadlerKarte$1.onClick(RadlerKarte.java:34) at android.view.View.performClick(View.java:7201) at android.view.View.performClickInternal(View.java:7170) at android.view.View.access$3500(View.java:806) at android.view.View$PerformClick.run(View.java:27562) at android.os.Handler.handleCallback(Handler.java:883) at android.os.Handler.dispatchMessage(Handler.java:100) at android.os.Looper.loop(Looper.java:214) at android.app.ActivityThread.main(ActivityThread.java:7682) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:516) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950) I/Process: Sending signal. PID: 31111 SIG: 9 、parent.js 和 child1.js

child2.js

parent.js

let child1 = require("./child1.js") let child2 = require("./child2.js") let key = "*****" child1.start(key) child2.start();

child1.js

let key = false; module.exports = { action: async() => { return someApi.get(key); },start: async(_key) => { key = key; } }

child2.js

问题

我需要从 module.exports = { action: async() => { let res = await child1.action() ... },start: async() => { // startup actions } } 内的 child1 运行一个函数，但我不能使用 child2，因为 require 只能有 1 个实例

有人知道解决办法吗？谢谢

解决方法

我认为你问错了问题:)
如果您需要 child1 是唯一的，您应该使用单音并在您需要的任何地方都需要它。

//child1
let instance

module.export = () => {
  if(!instance) {
     instance = {
    action: async() => {
        return someApi.get(key);
    },start: async(_key) => {
        key = key;
    }
   }
   return instance
}

我个人不喜欢单调方法，但它可以很方便

您可以尝试的另一种方法是将 child1 服务实例注入 child2 'constructor'
你只需要导出一个函数而不是一个对象
parent.js

let child1 = require("./child1.js")()
let child2 = require("./child2.js")(child1)
let key = "*****"

child1.start(key)
child2.start();

child2

module.exports = (child1) => {
    
    const action =  async() => {
        let res = await child1.action()
        ...
    }
    const start =  async() => {
        // startup actions
    }
    return {action,start}
}