Qt中静态变量使用方法

#ifndef DATAVAR_H
#define DATAVAR_H
 
#include <QObject>
 
class dataVar : public QObject
{
    Q_OBJECT
public:
    explicit dataVar(QObject *parent = 0);
    static QString loginName ;//登录名
signals:
    
public slots:
    
};
#endif // DATAVAR_H

#include "datavar.h"
//注意 初始化一定放在最前面
QString dataVar::loginName = "";
dataVar::dataVar(QObject *parent) :
QObject(parent)

{

}

#include "datavar.h"

dataVar::loginName = ui->comUserName->currentText() ;