Home >Web Front-end >JS Tutorial >Detailed explanation of JS generating random numbers

Detailed explanation of JS generating random numbers

coldplay.xixiforward: 2020-06-13 17:22:003149browse

Detailed explanation of JS generating random numbers

<script>   
function GetRandomNum(Min,Max){   
    var Range = Max - Min;   
    var Rand = Math.random();   
    return(Min + Math.round(Rand * Range));   
}
 
var num = GetRandomNum(1,10);   
alert(num);   
</script>

Generating random strings

function generateMixed(n) {
    var chars = [&#39;0&#39;,&#39;1&#39;,&#39;2&#39;,&#39;3&#39;,&#39;4&#39;,&#39;5&#39;,&#39;6&#39;,&#39;7&#39;,&#39;8&#39;,&#39;9&#39;,&#39;A&#39;,&#39;B&#39;,&#39;C&#39;,&#39;D&#39;,&#39;E&#39;,&#39;F&#39;,&#39;G&#39;,&#39;H&#39;,&#39;I&#39;,&#39;J&#39;,&#39;K&#39;,&#39;L&#39;,&#39;M&#39;,&#39;N&#39;,&#39;O&#39;,&#39;P&#39;,&#39;Q&#39;,&#39;R&#39;,&#39;S&#39;,&#39;T&#39;,&#39;U&#39;,&#39;V&#39;,&#39;W&#39;,&#39;X&#39;,&#39;Y&#39;,&#39;Z&#39;];
     var res = "";
     for(var i = 0; i < n ; i ++) {
         var id = Math.ceil(Math.random()*35);
         res += chars[id];
     }
     return res;
}

Math.random();

The result is a random number between 0-1 (including 0, excluding 1)

Math.floor(num);

The parameter num is a numerical value, and the function result is the integer part of num.

Math.round(num);

The parameter num is a numerical value, and the function result is the integer after num is rounded.

Math: Mathematical object, providing mathematical calculations on data.

Math.random();

Returns a random number between 0 and 1 (including 0, excluding 1).

Math.ceil(n);

Returns the smallest integer greater than or equal to n.

Math.ceil(Math.random()*10);

Mainly obtains random integers from 1 to 10, and the probability of obtaining 0 is extremely small.

Math.round(n);

Returns the value of n after rounding.

Use Math.round(Math.random());

to obtain a random integer from 0 to 1 in a balanced manner.

Math.round(Math.random()*10);

Can basically obtain random integers from 0 to 10 in a balanced manner, where the minimum value 0 and the maximum value are obtained The probability of 10 is less than half.

Math.floor(n);

Returns the largest integer less than or equal to n.

Math.floor(Math.random()*10);

Random integers from 0 to 9 can be obtained evenly.

Recommended tutorial: "JS Basic Tutorial"

The above is the detailed content of Detailed explanation of JS generating random numbers. For more information, please follow other related articles on the PHP Chinese website!

Statement：

This article is reproduced at:liqingbo.cn. If there is any infringement, please contact admin@php.cn delete

Previous article：What does js mean?Next article：What does js mean?

See more

Detailed explanation of JS generating random numbers

Related articles