loglog(x,y)x 轴和y 轴均为对数刻度（Logarithmic Scale）semilogx(x,y) semilogx(x,y)x 轴为对数刻度，y 轴为线性刻度semilogy(x,y) semilogy(x,y)x 轴为线性刻度，y 轴为对数刻度
