let buffer = ['一等奖','二等奖','三等奖','四等奖','五等奖']; // 奖池
let buff_probability = [0.1, 0.3, 0.5, 0.7, 0.9]; // 概率
for (var i=0;i<100;i++){
console.log( randomProbability(buffer, buff_probability ));
}
function randomProbability(arr1, arr2) {
var sum = 0,
factor = 0,
random = Math.random();
for(var i = arr2.length - 1; i >= 0; i--) {
sum += arr2[i]; // 统计概率总和
};
random *= sum; // 生成概率随机数
for(var i = arr2.length - 1; i >= 0; i--) {
factor += arr2[i];
if(random <= factor) return arr1[i];
};
return null;
}
JavaScript基础算法:中奖奖池设定概率
最新推荐文章于 2024-12-30 23:25:26 发布