Qt运行javascript脚本利用QScriptValueList

程序通过调用js脚本的函数执行计算（将计算公式写入js脚本，在程序中通过传参数调用js脚本中的函数进行计算，最后将计算结果返回，显示到界面）

//DoJS.pro

#-------------------------------------------------
#
# Project created by QtCreator 2017-03-22T10:16:33
#
#-------------------------------------------------
 
QT       += core gui script
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = DoJS
TEMPLATE = app
 
 
SOURCES += main.cpp\
        widget.cpp
 
HEADERS  += widget.h
 
FORMS    += widget.ui
 
DISTFILES += \
    TransCal.js
 
RESOURCES += \
    dojs.qrc

//widget.h

#ifndef WIDGET_H
#define WIDGET_H
 
#include <QWidget>
 
namespace Ui {
class Widget;
}
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
 
    void readJS();
 
private slots:
    void on_btn_cal_clicked();
 
private:
    Ui::Widget *ui;
};
 
#endif // WIDGET_H

//widget.cpp

#include "widget.h"
#include "ui_widget.h"
 
#include <QDebug>
#include <QFile>
#include <QTextStream>
#include <QScriptEngine>
#include <QScriptValue>
#include <QScriptValueList>
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
 
    ui->lineEdit_var1->setText("12");
    ui->lineEdit_var2->setText("0.5");
}
 
Widget::~Widget()
{
    delete ui;
}
 
void Widget::readJS()
{
    QString result = "";
    QFile scriptFile(":/TransCal.js");
    if (!scriptFile.open(QIODevice::ReadOnly))
    {
        result.clear();
        qWarning() << "encodePass.js open failed";
        return;
    }
    QTextStream out(&scriptFile);
    QString contents = out.readAll();
    scriptFile.close();
 
    double var1 = ui->lineEdit_var1->text().toDouble();
    double var2 = ui->lineEdit_var2->text().toDouble();
    qDebug() << "var1:" << var1 << "var2:" << var2;
 
    QScriptValueList args;      //调用js方法时传入的参数
    args << QScriptValue(var1) << QScriptValue(var2);
    QScriptEngine engine;
    QScriptValue js = engine.evaluate(contents);        //个人理解：加载js文本到操作引擎
    QScriptValue func;
    func = engine.globalObject().property("trans2wCal");   //调用js方法
    result = func.call(QScriptValue(), args).toString();
    qDebug() << "result:" << result;
    ui->lineEdit_sub->setText(result);
 
    func = engine.globalObject().property("trans3wCal");   //调用js方法
    result = func.call(QScriptValue(), args).toString();
    qDebug() << "result:" << result;
    ui->lineEdit_mul->setText(result);
}
 
void Widget::on_btn_cal_clicked()
{
    readJS();
}

//TransCal.js

//trans.js
 
function trans2wCal(var1,var2)
{
    return var1+var2;
}
 
function trans3wCal(var1,var2)
{
    return var1*var2+5;
}

//资源文件:dojs.qrc

//界面:widget.ui