JS 数学对象

2017-08-14 14:38:17 Albin Wong 474

1. 计四舍五入(小数点后一位)
```javascript
var t = 3.46;
var res = Math.round(t); // 3
var res = Math.round(4.6);
```

2. 最大值  
```javascript
var res = Math.max(1,21,3,1,51,24,1,31,3,13,1,231,23,13,1,321,23,124,1,241);  
var res = Math.max(999,Infinity,-5); // Infinity
```

3. 最小值  
```javascript
var res = Math.min(1,23,1,4,12,51,25,1,31,24,1,24,123,1,23,154,23,45,235,2,1,4,1,21,3,1,21,31,32,-12312,1231412);  
var res = Math.max(415,-415,-Infinity,-5); // -Infinity
```

4. 计算绝对值  |-20|  `var res = Math.abs(-20); //20`

5. 退一取整  `var res = Math.floor(3.9); // 3`

6. 进一取整  `var res = Math.ceil(4.1); // 5`

7. 幂运算  `var res = Math.pow(3,3); // 27`

8. 开方运算  `var res = Math.sqrt(64); // 8`

9. 获取一个从0到1的随机值 18位 [0, 1)
```javascript
    var res = Math.random();
    var res = Math.random()*10; // 获取从0到10的随机数
    var res = Math.ceil(Math.random()*10); // 获取1到10的随机整数
    var res = Math.ceil(Math.random()*10)+4; // 获取5到14的随机整数
    var res = Math.ceil(Math.random()*(n-m+1))+(m-1); // 从m到n的随机值 m-n
    function rand(m, n) {
        return Math.ceil(Math.random()*(n-m+1))+m-1;
    }
```

(3) Comments

John Doe- Reply

February 26, 2013 at 1:18 pm
- saqib sarwar- Reply
  
  February 26, 2013 at 1:20 pm
  
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John Doe- Reply

February 26, 2013 at 1:27 pm

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JS 数学对象

(3) Comments

John Doe- Reply

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John Doe- Reply

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