javascript Math对象
1 <!DOCTYPE html> 2 <html lang="en"> 3 <head> 4 <meta charset="UTF-8"> 5 <title>Document</title> 6 </head> 7 <body> 8 <script> 9 var num = 1.4; 10 console.log(Math.abs(num)); //取绝对值：1.4 11 console.log(Math.floor(num)); //向下取整：1 12 console.log(Math.ceil(num)); //向上取整：2 13 console.log(Math.round(num)); //四舍五入取整，正数四舍五入，负数五舍六入：1 14 console.log(Math.random()); //随机数0-1 15 console.log(Math.random()*100); //随机数0-100 16 console.log(Math.floor(Math.random()*100)); //0-100的随机数向下取整 17 18 var num1 = -0.6; 19 console.log(Math.abs(num1)); //0.6 20 console.log(Math.floor(num1)); //-1 21 console.log(Math.ceil(num1)); //0 22 console.log(Math.round(num1)); //-1 23 </script> 24 </body> 25 </html>
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