75 lines
1.8 KiB
HTML
75 lines
1.8 KiB
HTML
<!DOCTYPE html>
|
||
<html lang="en">
|
||
<head>
|
||
<meta charset="UTF-8">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0">
|
||
<title>Document</title>
|
||
</head>
|
||
<body>
|
||
|
||
|
||
<script>
|
||
|
||
//Math
|
||
// console.log(Math);
|
||
|
||
//00-随机数
|
||
//0 - 1的随机数(不包含0和1)
|
||
// console.log(Math.random());
|
||
// for (let index =0; index<10000;index++){
|
||
// let n = Math.random();
|
||
// if(n==0){
|
||
// console.log("n包含0");
|
||
// }
|
||
// if(n==1){
|
||
// console.log("n包含1");
|
||
// }
|
||
// }
|
||
|
||
//00-1 如何生产0-25的随机数 (不包含边界值)
|
||
//生成0-n的随机数 直接*n
|
||
// console.log(Math.random()*25);
|
||
|
||
//00-2 如何生成 5-25 ?
|
||
//n-m的随机数
|
||
//Math.random()* (m-n) + n
|
||
// console.log(Math.random()*20 + 5);
|
||
|
||
|
||
|
||
//01-取整
|
||
|
||
//01-1 向上取整
|
||
// console.log(Math.ceil(1.1));
|
||
// console.log(Math.ceil(1.9));
|
||
|
||
|
||
//01-2 向下取整
|
||
// console.log(Math.floor(1.1));
|
||
// console.log(Math.floor(1.9));
|
||
|
||
|
||
//01-3 四舍五入
|
||
// console.log(Math.round(1.4));
|
||
// console.log(Math.round(1.5));
|
||
// console.log(Math.round(1.6));
|
||
|
||
|
||
//02-其他
|
||
// 绝对值
|
||
console.log(Math.abs(-99));
|
||
console.log(Math.abs(-99.222));
|
||
console.log(Math.abs(99));
|
||
console.log(Math.abs(99.222));
|
||
|
||
//保留小数
|
||
//针对number 结果为string
|
||
console.log(8.968).toFixed(2);
|
||
|
||
|
||
|
||
</script>
|
||
|
||
|
||
</body>
|
||
</html> |