对表的第一个 < td > 列使用不同的样式

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This should help. Its CSS3 :first-child where you should say that the first tr of the table you would like to style. http://reference.sitepoint.com/css/pseudoclass-firstchild

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最佳答案

You could use the n-th child selector.

to target the nth element you could then use:

td:nth-child(n) {
/* your stuff here */
}

(where n starts at 1)

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If you've to support IE7, a more compatible solution is:

/* only the cells with no cell before (aka the first one) */
td {
padding-left: 20px;
}
/* only the cells with at least one cell before (aka all except the first one) */
td + td {
padding-left: 0;
}

Also works fine with li; general sibling selector ~ may be more suitable with mixed elements like a heading h1 followed by paragraphs AND a subheading and then again other paragraphs.

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The :nth-child() and :nth-of-type() pseudo-classes allows you to select elements with a formula.

The syntax is :nth-child(an+b), where you replace a and b by numbers of your choice.

For instance, :nth-child(3n+1) selects the 1st, 4th, 7th etc. child.

td:nth-child(3n+1) {
/* your stuff here */
}

:nth-of-type() works the same, except that it only considers element of the given type ( in the example).

For more information about nth-child https://developer.mozilla.org/es/docs/Web/CSS/:nth-child

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To select the first column of a table you can use this syntax

tr td:nth-child(1n + 2){
padding-left: 10px;
}