例如:<p>1</p>
<p>2</p>
<p>3</p>
<p>4</p>
<p>5</p>
<p>6</p>
<p>7</p>
<p>8</p>
<p>9</p>
<p>10</p>
<p>11</p>
<p>12</p>怎么选择1,2跳过3,4选择5,6以此类推
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<!DOCTYPE html> <html> <head> <title></title> <style type="text/css"> .demo{ display: inline-block;width: 50px;height: 50px; background-color: #e3e3e3; } .demo:nth-child(4n+1),.demo:nth-child(4n+2){ background-color: red; } </style> </head> <body> <div class="demo-list"> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> <div class="demo"></div> </div> </body> </html>
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