jquery random number usage

Random numbers are a common application in jQuery and are often used in various scenarios such as generating random verification codes and randomly displaying advertisements. Here we will introduce some ways to generate random numbers using jQuery.

1. Math.random() method

The Math.random() method can generate a random number between 0 and 1. This is a commonly used method to generate random numbers in JavaScript. We can use it to generate random numbers and then convert them into integers.

For example, if we want to generate a random number between 0 and 99, we can use the following code:

var randomNum = Math.floor(Math.random() * 100);

Explain the meaning of the above code:

1. The Math.random() method will generate a random number between 0 and 1;
2. Multiply by 100, you will get 0 to A number between 100;
3. Use the Math.floor() method to round down to get an integer between 0 and 99.

At this point, we can assign the generated random number to the DOM element that needs to be used.

For example, we can use the following code to assign the generated random number to a tag:

$('span').text(randomNum);

2. Custom function

If we need to generate random numbers within a certain range, we can use a custom function to achieve this. For example, the following code can generate a random number from 10 to 50:

function getRandomNum(min, max) {
var randomNumber = Math.floor(Math.random() * (max - min 1)) min;
return randomNumber;
}

In the above function:

1. min and max are the ranges we need to generate random numbers, which can be used in the function Pass in when calling;
2. Math.random() method will generate a random number between 0 and 1;
3. (max - min 1) represents the range of random numbers we need to generate;
4. Use the Math.floor() method to round down to get a random integer.

When calling the function, you can write like this:

var randomNum = getRandomNum(10, 50);

At this time, randomNum will get a value between 10 and 50 random number between.

3. Plug-ins

In addition to custom functions, we can also use some jQuery plug-ins to generate random numbers. For example, the jquery.random plug-in provides the method random() to generate random numbers. The usage is as follows:

$.random(min, max);

Usage method and the customization mentioned above The function is similar.

4. Summary

There are many ways to generate random numbers in jQuery. You can use the Math.random() method, custom functions, or third-party plug-ins. According to different needs, we can choose a suitable method to generate random numbers.

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