/*下一曲*/
ui->pushButton_4->setStyleSheet("QPushButton{border-image: url(icon/ico_42x_Next_disabled.png);}"
"QPushButton:hover{border-image: url(icon/ico_42x_Next_active.png);}"
"QPushButton:pressed{border-image: url(icon/ico_42x_Next_active.png);}");
/*上一曲*/
ui->pushButton_5->setStyleSheet("QPushButton{border-image: url(icon/ico_42x_Previous_disabled.png);}"
"QPushButton:hover{border-image: url(icon/ico_42x_Previous_active.png);}"
"QPushButton:pressed{border-image: url(icon/ico_42x_Previous_active.png);}");