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<!DOCTYPE html> <html> <body> <p>1.797693134862315E+308是浮点数的极限。</p> <p>点击按钮亲自查看。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { document.getElementById("demo").innerHTML = 1.7976931348623157E+10308 + "<br>" + -1.7976931348623157E+10308; } </script> </body> </html>