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以回帖的形式进行记录。
选择第一行,用 $('tr:fisrt') 选择第N行用 $('tr:eq(n-1)') $("tr td:nth-child(2)")
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选择第一行,用 $('tr:fisrt')
选择第N行用 $('tr:eq(n-1)')
$("tr td:nth-child(2)")