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<!DOCTYPE html> <html> <body> <h1>Math.sign()</h1> <p>点击按钮查看不同的数字是正数还是负数：</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var a = Math.sign(3); var b = Math.sign(-3); var c = Math.sign(0); var x = a + "<br>" + b + "<br>" + c; document.getElementById("demo").innerHTML = x; } </script> </body> </html>