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<!DOCTYPE html> <html> <head> <style> div.ex1 { border-style: solid; border-color: #0000ff; } div.ex2 { border-style: solid; border-color: #ff0000 #0000ff; } div.ex3 { border-style: solid; border-color: #ff0000 #00ff00 #0000ff; } div.ex4 { border-style: solid; border-color: #ff0000 #00ff00 #0000ff rgb(250,0,255); } </style> </head> <body> <div class="ex1">单色边框！</div> <br> <div class="ex2">双色边框！</div> <br> <div class="ex3">三色边框！</div> <br> <div class="ex4">四色边框！</div> <p><strong>注意：</strong> border-color 属性单独使用不起作用。 首先使用 border-style 属性设置边框。</p> </body> </html>