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<!DOCTYPE html> <html> <body> <p>如果两个表达式都为真，则 AND 运算符 (&&) 返回真，否则返回假。</p> <p id="demo"></p> <script> var x = 6; var y = 3; document.getElementById("demo").innerHTML = (x < 10 && y > 1) + "<br>" + (x < 10 && y < 1); </script> </body> </html>