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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字</h2> <p>JavaScript 会在相乘时尝试将字符串转换为数字：</p> <p id="demo"></p> <script> var x = "100"; var y = "10"; var z = x * y; document.getElementById("demo").innerHTML = z; </script> </body> </html>