javascript Rhino：如何从 Java 调用 JS 函数
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Rhino: How to call JS function from Java
提问by instantsetsuna
I'm using Mozilla Rhino 1.7r2 (not the JDK version), and I want to call a JS function from Java.
我使用的是 Mozilla Rhino 1.7r2（不是 JDK 版本），我想从 Java 调用 JS 函数。
My JS function is like this:
我的JS函数是这样的：
function abc(x,y)
{
return x+y
}
How do I do this?
我该怎么做呢？
Edit: (The JS function is in a separate file)
编辑：（JS 函数在一个单独的文件中）
回答by Maurice Perry
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: when the function is loaded in the scope, along with other functions and variables
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();
}
