犀牛：如何從Java調用JS函數

Question

我正在使用Mozilla Rhino 1.7r2（不是JDK版本），我想從Java調用JS函數。

我的JS函數是這樣的：

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

我該怎麼辦呢？

編輯：（本JS功能是在一個單獨的文件）

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(); 
} 

UPDATE：當功能被裝載在的範圍內，與其他函數和變量

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(); 
}