How perform for obj follow mouse with angle?

This looks like it might be as simple as setting your position, instead of your pivot.

// add a graphics instance
var rec = new PIXI.Graphics();
rec.beginFill(0x00ff00);
rec.drawRoundedRect(-20, -65/2, 40, 65, 4); // Shifted so the rect is centered across 0,0

// setup
rec.pivot.set(0,0);                         // Pivot at the center 0,0
rec.position.set(500/2,500/2);
rec.rotation = 45 * Math.PI / 180;
stage.addChild(rec);
renderer.render(stage);


//** listener ********
    var updatePosition = function(event) {
      this.position.set(event.layerX,event.layerY); // Set postion, no offset.

      renderer.render(stage);
    };

    document.addEventListener('mousemove', updatePosition.bind(rec));