W3School TIY Editor
W3School 在线教程
改变方向
暗黑模式
运行代码
<!DOCTYPE html> <html> <body> <h1>JavaScript Math.sin()</h1> <p>Math.sin(x) 返回 x(以弧度计)的正弦:</p> <p>以弧度计的角度 = (以度数计的角度) * PI / 180。</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = "The sine value of 90 degrees is " + Math.sin(90 * Math.PI / 180); </script> </body> </html>