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At present, only learn two simple methods to help you achieve a random 0-100 between the 10 number of repeat, the specific contents are as follows
First Kind the feature that can be rewritten by using array length
Train of thought: You can use a for loop from 0 to 100 to put in an array, and then the 100 numbers are randomly disturbed by using sort (), and then by rewriting the length of the array to 10, you get 10 different numbers.
<! DOCTYPE html>
<html lang = "en">
<head>
<meta charset = "UTF-8">
<title> Document </ title>
<script>
var arr = [];
for (var i = 0; i <100; i ++) {// An array from 0 to 100
arr.push (i);
}
arr.sort (function () {// Randomly shuffle this array
return Math.random ()-0.5;
})
arr.length = 10; // Rewrite length
console.log (arr); // The console will output 10 different numbers
</ script>
</ head>
<body>
</ body>
</ html>
Second Kind utilizes the unique feature of the key value of the JSON object.
idea: first define an empty array and an empty JSON object,
<! DOCTYPE html>
<html lang = "en">
<head>
<meta charset = "UTF-8">
<title> Document </ title>
<script>
// json object, the key value is unique, and the key value can be a number
var arr = [];
var json = ();
while (arr.length <10) {
var k = Math.round (Math.random () * 100);
if (! json [k]) {
json [k] = true;
arr.push (k);
}
}
console.log (arr)
</ script>
</ head>
<body>
</ body>
</ html>
I hope this article will help you learn the JavaScript programming.
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