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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字</h2> <p>浮点运算并不总是 100% 准确。</p> <p id="demo"></p> <script> var x = 0.2 + 0.1; document.getElementById("demo").innerHTML = "0.2 + 0.1 = " + x; </script> </body> </html>