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