js生成指定範圍的隨機數
阿新 • • 發佈:2018-09-18
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一、min ≤ r ≤ max
function RandomNumBoth(Min,Max){ var Range = Max - Min; var Rand = Math.random(); var num = Min + Math.round(Rand * Range); //四舍五入 return num; }
二、min ≤ r < max
function RandomNum(Min, Max) { var Range = Max - Min; var Rand = Math.random();var num = Min + Math.floor(Rand * Range); //舍去 return num; }
三、min < r ≤ max
function RandomNum(Min, Max) { var Range = Max - Min; var Rand = Math.random(); if(Math.round(Rand * Range)==0){ return Min + 1; } var num = Min + Math.round(Rand * Range);return num; }
四、min < r < max
function RandomNum(Min, Max) { var Range = Max - Min; var Rand = Math.random(); if(Math.round(Rand * Range)==0){ return Min + 1; }else if(Math.round(Rand * Max)==Max) { index++; return Max - 1; }else{var num = Min + Math.round(Rand * Range) - 1; return num; } }
js生成指定範圍的隨機數