Shift register and method for driving the same, driving circuit and display device

A shift register, comprising:

• a pulling-up unit, which is connected to a first input terminal, a first clock signal terminal, a first level terminal, a pulling-down node and a pulling-up node, respectively, and is configured to control a voltage level at the pulling-up node according to a voltage level at the pulling-down node and signals inputted from the first input terminal, the first level terminal and the first clock signal terminal;
• a pulling-down unit, which is connected to a second input terminal, a second level terminal, the first level terminal, the pulling-down node and the pulling-up node, respectively, and is configured to control the voltage level at the pulling-down node according to the voltage level at the pulling-up node and signals inputted from the second input terminal, the second level terminal and the first level terminal;
• and
• an output unit, which is connected to the first level terminal, a second clock signal terminal, an output terminal, the pulling-down node and the pulling-up node, respectively, and is configured to provide an output signal through the output terminal according to the voltage levels of the pulling-down node and the pulling-up node and signals inputted from the first level terminal and the second clock signal terminal.