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<!DOCTYPE html> <html> <body> <h2>JavaScript 运算符</h2> <p>在此示例中，y 在分配给 x 之前递减（预递减）。</p> <p id="demo1"></p> <p id="demo2"></p> <script> var y = 5; var x = --y; document.getElementById("demo1").innerHTML = y; document.getElementById("demo2").innerHTML = x; </script> </body> </html>