java - Rhino:如何从 Java 调用 JS 函数

Question

我正在使用 Mozilla Rhino 1.7r2(不是 JDK 版本)，我想从 Java 调用 JS 函数。

我的JS函数是这样的:

function abc(x,y)
{
  return x+y
}

我该怎么做？

编辑:(JS函数在单独的文件中)

Answer 1

String script = "function abc(x,y) {return x+y;}";
Context context = Context.enter();
try {
    ScriptableObject scope = context.initStandardObjects();
    Scriptable that = context.newObject(scope);
    Function fct = context.compileFunction(scope, script, "script", 1, null);
    Object result = fct.call(
            context, scope, that, new Object[] {2, 3});
    System.out.println(Context.jsToJava(result, int.class));
} finally {
    Context.exit();
}

更新:当函数与其他函数和变量一起加载到作用域中时

String script = "function abc(x,y) {return x+y;}"
        + "function def(u,v) {return u-v;}";
Context context = Context.enter();
try {
    ScriptableObject scope = context.initStandardObjects();
    context.evaluateString(scope, script, "script", 1, null);
    Function fct = (Function)scope.get("abc", scope);
    Object result = fct.call(
            context, scope, scope, new Object[] {2, 3});
    System.out.println(Context.jsToJava(result, int.class));
} finally {
    Context.exit();
}