如何删除表中行和列之间的多余空间？

将此CSS重置添加到您的CSS代码中：

html, body, div, span, applet, object, iframe,h1, h2, h3, h4, h5, h6, p, blockquote, pre,a, abbr, acronym, address, big, cite, pre,del, dfn, em, img, ins, kbd, q, s, samp,small, strike, strong, sub, sup, tt, var,b, u, i, center,dl, dt, dd, ol, ul, li,fieldset, form, label, legend,table, caption, tbody, tfoot, thead, tr, th, td,article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary,time, mark, audio, video {    margin: 0;    padding: 0;    border: 0;    font-size: 100%;    font: inherit;    vertical-align: baseline;}article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section {    display: block;}body {    line-height: 1;}ol, ul {    list-style: none;}blockquote, q {    quotes: none;}blockquote:before, blockquote:after,q:before, q:after {    content: '';    content: none;}table {    border-collapse: collapse;    border-spacing: 0;}

它将有效地重置CSS，摆脱填充和边距。