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<!DOCTYPE html> <html> <body> <p>单击该按钮可将 href 值设置为链接到指定的邮件地址（仅当您安装了邮件时才有效）。</p> <button onclick="myFunction()">发送邮件</button> <script> function myFunction() { location.href = "mailto:someone@example.com"; } </script> </body> </html>