js realizes the occurrence of 1,2,3,5 according to a certain probability

This article mainly introduces js to implement the generation of numbers 1, 2, 3, and 5 according to probability. Friends who need it can refer to it.

js is generated according to the configured probability. The probability rules are as follows:
1 ------------50%

2------------30%

3-------- ----15%

5------------5%

Simple code

function myRandom() { var rand = Math.random(); if (rand < .5) return 1; if (rand < .8) return 2; if (rand < .95) return 3; return 5; }

Complicated

function prizeRand(oArr) { var sum = 0; // 总和 var rand = 0; // 每次循环产生的随机数 var result = 0; // 返回的对象的key console.log(oArr); // 计算总和 for (var i in oArr) { sum += oArr[i][0]; } // 思路就是如果设置的数落在随机数内，则返回，否则减去本次的数 for (var i in oArr) { rand = Math.floor(Math.random()*sum + 1); if (oArr[i][0] >= rand) { result = oArr[i][0]; break; } else { sum -= oArr[i][0]; } } return result; } var oArr = {'5':[5, 'Mac'], '3':[15, 'iPhone'], '2':[30, 'iPad'], '1':[50, 'iWatch']}; console.log(prizeRand(oArr));

You can choose according to your needs. It is recommended to check the previous article of Script House.

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