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                [Math](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Math "Math 是一個內置對象,它擁有一些數學常數屬性和數學函數方法。Math 不是一個函數對象。") Math:? ?無須聲明直接用 Math.ceil(數值)? 進一取整 Math.floor(數值);? ?舍去取整 Math.round(數值);? 四舍五入 Math.max(數值); 最大值 Math.min(數值); 最小值 Math.pow(數值,n次方);? ?冪 Math.random(數值);? 隨機數(0≤X<1) 獲取0-5隨機數 ~~~ Math.floor(Math.random()*6); ~~~ 獲取10-100的隨機數 ~~~ Math.ceil(Math.random()*1000000)%((100-10)+1)+10; ~~~ 獲取n~m的隨機數? 原理? ?當a與b取余時 余數的范圍是(b-1) ~~~ function(n,m){ return Math.ceil(Math.random()*1000000)%((m-n)+1)+n; } ~~~
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