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代码示例！[这里写图片描述]（https://img-blog.csdn.net/20180828121351641?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYXhpbmhvbmc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70）！[这里写图片描述]（https://img-blog.csdn.net/20180828121415112?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYXhpbmhvbmc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70） mapPartitionsWithIndex- -Transformation算类子代码示例！[这里写图片描述]（https://img-blog.csdn.net/20180828121454989?watermark/2/text/aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYXhpbmhvbmc=/font/5a6L5L2T/fontsize/400/fill/ I0JBQkFCMA == / dissolve / 70）！[ 这里写图片描述] （