如何创建一个“类似数组”的数组JS代码可以就地修改的属性吗？
我有一个 QObject 派生类，如下所示：
class TestObject : public QObject
{
Q_OBJECT
Q_PROPERTY(QStringList contents READ contents WRITE setContents)
public:
QStringList contents() { return m_contents; }
void setContents(QStringList contents) { m_contents = contents; }
private:
QStringList m_contents;
};
该类包含一个属性，该属性是 QString 的列表。如果我想向脚本公开此类的实例，我可以使用以下命令来实现：
// Instance
TestObject test_instance;
// Expose it to the script engine
QScriptEngine script_engine;
QScriptValue val;
val = script_engine.newQObject(&test_instance);
engine.globalObject().setProperty("TestObject", val);
但是，当我在 Javascript 代码中向列表中添加字符串时，它实际上并没有添加该字符串
TestObject.contents.push("Test string!");
print(TestObject.contents.length);
：上面是0，表示该字符串没有添加到列表中。仔细检查 MOC 生成的代码可以发现，当访问属性 contents 时，仅调用 contents() 函数，该函数返回列表的副本，该列表将被调用。项目已添加。原名单未作修改。
如何保留对列表的更改？
I have a QObject-derived class that looks like this:
class TestObject : public QObject
{
Q_OBJECT
Q_PROPERTY(QStringList contents READ contents WRITE setContents)
public:
QStringList contents() { return m_contents; }
void setContents(QStringList contents) { m_contents = contents; }
private:
QStringList m_contents;
};
The class contains one property that is a list of QStrings. If I want to expose an instance of this class to a script, I can do so with the following:
// Instance
TestObject test_instance;
// Expose it to the script engine
QScriptEngine script_engine;
QScriptValue val;
val = script_engine.newQObject(&test_instance);
engine.globalObject().setProperty("TestObject", val);
However, when I go to add a string to the list in Javascript code, it doesn't actually add the string:
TestObject.contents.push("Test string!");
print(TestObject.contents.length);
The output of the above is 0, indicating that the string was not added to the list. Close examination of the MOC-generated code reveals that when the property contents is accessed, only the contents() function is called, which returns a copy of the list to which the item is added. The original list is unmodified.
How can I have the changes to the list be persisted?
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评论（1）
您可以通过返回对 QStringList 的引用而不是副本来解决此问题
更安全的选择是封装对内容的访问，iirc 任何声明为槽的函数都可以从 JavaScript 访问而不会出现问题，因此
也应该这样做
You can probably fix this by returning a reference to you QStringList and not a copy
The safer option is to encapsulate access to the contents, iirc any function that is declared a slot can be accessed from JavaScript without problems so
should do the trick too