An explanation of randomly generated events in JavaScript

This article mainly introduces a detailed explanation of JavaScript's random generation of events based on probability, which has certain reference value. Interested friends can refer to it

Recently made a JavaScript random generation of events based on probability, so I sorted out my thoughts and wrote a small demo:

/* *在抽奖的活动中经常会用到这个算法，不同奖项的获取概率不同，要按概率去随机生成对应的奖品 * */ function random(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; }; // test var a = ['mac', 'iphone', 'vivo', 'OPPO']; var b = [0.1, 0.2, 0.3, 0.4]; console.log(random(a, b));

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