4日6日--Math的常用方法
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Math的常用方法1</title> <script type="text/javascript"> var n=-10; console.log(Math.abs(n));//10 console.log(Math.pow(n,2));//100 console.log(Math.sqrt(25));//5 //3次方根:8的1/3次方 console.log(Math.pow(8,1/3)); var ret=Math.sin(Math.PI/6) console.log(ret.toFixed(3));//保留小数点后尾数,返回string </script> </head> <body> </body> </html>
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Math的常用方法2</title> <script type="text/javascript"> var n=prompt("pls input:")*1; var ret=Math.floor(n); console.log("floor:"+ret); ret=Math.ceil(n); console.log("ceil:"+ret); ret=Math.round(n); console.log("round:"+ret); </script> </head> <body> </body> </html>