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<!DOCTYPE html> <html> <body> <p>单击该按钮可显示不同数字的以 2 为底的对数。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var a = Math.log2(2.7183); var b = Math.log2(2); var c = Math.log2(1); var d = Math.log2(0); var e = Math.log2(-1); var x = a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e; document.getElementById("demo").innerHTML = x; } </script> </body> </html>