Detailed explanation of how to find random numbers in js

This article mainly shares with you the detailed explanation of the method of finding random numbers in js. It mainly shares it with you in text and code. I hope it can help you.

Find a randomly selected value within a certain positive range:

值 = Math.floor(Math.random() * 可能值的总数 + 第一个可能的值)

For example:

1. Find a random integer within 1-100

var result = Math.floor(Math.random() * 100 + 1);

2. Randomly take out an item from an array

var array = ['a','b','c','d','e','f','g'];

/*array.length === 7,取0-6之间的随机整数*/
var index = Math.floor(Math.random() * 7 + 0);

/*随机取的结果是*/
var result = array[index];
console.log(result);

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