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CSS :nth-child() 伪类
trycss_sel_nth-child
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<!DOCTYPE html> <html> <head> <style> /* Selects every fourth element among any group of siblings */ :nth-child(4) { background-color: yellow; } /* Selects the second element of div siblings */ div:nth-child(2) { background-color: red; } /* Selects the second li element in a list */ li:nth-child(2) { background-color: lightgreen; } </style> </head> <body> <h1>Demo of :nth-child</h1> <div> <p>This is some text.</p> </div> <div> <p>This is some text.</p> </div> <div> <p>This is some text.</p> </div> <ul> <li>First list item</li> <li>Second list item</li> <li>Third list item</li> <li>Fourth list item</li> <li>Fifth list item</li> </ul> </body> </html>