axis lines=middle, % 坐标轴位置 axis line style={->, thick}, % 坐标轴箭头 xlabel={$x$}, % x轴标注 ylabel={$y$}, % y轴标注 xlabel style={at={(ticklabel cs:1)}, anchor=north west}, % x轴标签位置 ylabel style={at={(ticklabel cs:1)}, anchor=south west}, % y轴标签位置 xtick={-3,-2,-1,0,1,2,3}, % x轴刻度 ytick={-2,-1,0,1,2,3,4,5,6}, % y轴刻度