How to generate random numbers in javascript-JS Tutorial-php.cn

How to generate random numbers in javascript

清浅

Release： 2019-02-18 09:16:21

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In JavaScript, you can use the Math.random() function to generate random numbers from 0 to 1, or you can set the value of the function to generate random numbers in any range or different ones. Random number

In JavaScript, you can use the Math.random() function to generate a random number between 0 and 1, but this often cannot meet our daily needs. But we can use other methods to make it generate the random numbers we want. What I will share with you today is to generate random numbers through the Math.random() function, which has a certain reference effect and I hope it will be helpful to everyone.

How to generate random numbers in javascript

【Recommended courses: JavaScript Tutorial, JavaScript Tutorial Manual】

Random number generation

In JavaScript, random numbers from 0 to 1 can be generated through the following statement:

Math.round(Math.random());

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If we want to set it in a specified range The random numbers in can also be generated by the above function

Example: Generate random numbers between 8 and 100

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>
<script>
var num=Math.floor(Math.random()*100+8);
document.write(num);
</script>
</head>
<body>
</body>
</html>

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How to generate random numbers in javascript

If you want to generate a range from 10 to 100, you only need to change the following number 8 to 10. We can use the above method Implement the generation of random numbers within a custom range

Generate non-repeating random numbers

Sometimes random numbers can be generated through specific methods but there will be no differences between them Repeat, as shown below

<script>
// 定义存放生成随机数的数组 
var array=new Array(); 
// 循环N次生成随机数 
for(var i = 0 ; ; i++){ 
// 只生成10个随机数 
if(array.length<10){ 
generateRandom(10); 
}else{ 
break; 
} 
} 
// 循环遍历随机数数组 
for(var i = 0 ; i < array.length; i++){ 
document.write(array[i]); 
} 
// 生成随机数的方法 
function generateRandom(count){ 
var rand = parseInt(Math.random()*count); 
for(var i = 0 ; i < array.length; i++){ 
if(array[i] == rand){ 
return false; 
} 
} 
array.push(rand); 
} 
</script>

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Rendering:

How to generate random numbers in javascript

##We can see from the above picture that each generated All random numbers are different

Summary: The above is the entire content of this article. I hope this article can help everyone learn how to generate random numbers.

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