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<!DOCTYPE html> <html> <head> <style> table, th, td { border: 1px solid black; } </style> </head> <body> <h1>为 th 添加背景颜色</h1> <table> <tr> <th style="background-color:#FF0000">Month</th> <th style="background-color:#00FF00">Savings</th> </tr> <tr> <td>January</td> <td>$100</td> </tr> </table> </body> </html>