table{table_layout:fixed;border-collapse: collapse;border-spacing: 0}
border-collapse: collapse 边框合并在一起
border-spacing: 0 边框间距为0
table{table_layout:fixed;border-collapse: collapse;border-spacing: 0}
border-collapse: collapse 边框合并在一起
border-spacing: 0 边框间距为0