Three Implementation ideas for JavaScript to generate random numbers without duplicates _ javascript skills

In JavaScript, random numbers are usually generated repeatedly, but sometimes we need random numbers that are not repeated. How can we achieve this? This article provides a solution. If you need a friend, you can refer to the common random numbers generated in JavaScript. But sometimes we need a random number that is not repeated. How can this problem be achieved? The following describes three methods to generate random numbers that are not repeated and compare them. The efficiency of this method is high.

Method 1
Idea: first create an array ranging from 1 to 3000, fetch a number each time, and then remove the number from the array, so that it can never be repeated.

The Code is as follows: