Nashorn:名称空间内的调用函数 [英] Nashorn: Call function inside of a namespace

问题描述

我已经使用NashornScriptEngine评估了以下脚本:

I have evaluated the following script using the NashornScriptEngine:

var Namespace = {
    test: function()
    {
        return "It works";
    }
}

现在我要调用函数test.

Now I want to call the function test.

使用nashorn引擎的方法invokeFunction时，将引发以下异常:

When using the method invokeFunction of the nashorn engine, the following exception is thrown:

java.lang.NoSuchMethodException: No such function Namespace.test

如何调用此函数?

推荐答案

您正在尝试访问名为window["Namespace.test"]而不是window.Namespace.Test的全局函数.您首先需要获得对Namespace的引用，然后可以调用

You are trying to access a global function called window["Namespace.test"], not window.Namespace.Test. You first need to get a reference to Namespace, then you can call invocable.invokeMethod specifying Namespace as its context (this).

例如，要调用JSON.parse()，可以使用以下命令:

For example, to call JSON.parse(), you can use the following:

Object json = engine.eval("JSON"); // Or "Namespace" in your case
Object data = invocable.invokeMethod(json, "parse", contactJson); //"test" for the case you mention

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