QJSEngine

QJSEngine 

#include <QJSEngine>

 

Public Types

enum	Extension { TranslationExtension, ConsoleExtension, GarbageCollectionExtension, AllExtensions }
flags	Extensions

Public Functions

	QJSEngine()
	QJSEngine(QObject *parent)
virtual	~QJSEngine() override
void	collectGarbage()
QJSValue	evaluate(const QString &program, const QString &fileName = QString(), int lineNumber = 1)
T	fromScriptValue(const QJSValue &value)
QJSValue	globalObject() const
void	installExtensions(QJSEngine::Extensions extensions, const QJSValue &object = QJSValue())
QJSValue	newArray(uint length = 0)
QJSValue	newObject()
QJSValue	newQMetaObject(const QMetaObject *metaObject)
QJSValue	newQMetaObject()
QJSValue	newQObject(QObject *object)
QJSValue	toScriptValue(const T &value)

 

 

 

详细说明

QJSEngine类提供了一个用于评估JavaScript代码的环境。

 

案例1：

 QJSEngine myEngine;
 QJSValue three = myEngine.evaluate("1 + 2");

 

案例2：

  QJSValue fun = myEngine.evaluate("(function(a, b) { return a + b; })");
  QJSValueList args;
  args << 1 << 2;
  QJSValue threeAgain = fun.call(args);

 

案例3：

  QString fileName = "helloworld.qs";
  QFile scriptFile(fileName);
  if (!scriptFile.open(QIODevice::ReadOnly))
      // handle error
  QTextStream stream(&scriptFile);
  QString contents = stream.readAll();
  scriptFile.close();
  myEngine.evaluate(contents, fileName);

 

 

 

 

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