Effect of Light on Anthocyanin Biosynthesis and Metabolism of Brassica oleracea L. and Analysis on Expression Pattern of Anthocyanin Structural Genes Comparation of the Photosynthetic Characteristics of Purple Cabbage and Cabbage Comparation of the Photosynthetic Characteristics of Purple Cabbage and Cabbage Ultrasonic Condition Optimization for Anthocyanin Extraction from Purple Cabbage by Using Response Surface Methodology (RSM)