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<!DOCTYPE html> <html> <body> <h2>JavaScript 错误</h2> <p>您不能将数字的有效位数设置为 500：</p> <p id="demo"> <script> var num = 1; try { num.toPrecision(500); } catch(err) { document.getElementById("demo").innerHTML = err.name; } </script> </body> </html>