How to add random numbers in javaScript

In javascript, you can use "Math.random()" to add random numbers. The "Math.random()" function returns a random floating point number ranging from 0 to less than 1, that is, from 0 (including 0) upwards, but excluding 1 (excluding 1). It cannot be selected or reset by the user. Set.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

<script type="text/javascript">
document.write(Math.random())
</script>

Explanation

• ##Math.random(); The result is a random number between 0-1 (including 0, not Including 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.

When using Math.ceil(Math.random()*10);, you mainly get random integers from 1 to 10, and the probability of getting 0 is very 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 evenly.

When using Math.round(Math.random()*10);, random integers from 0 to 10 can be obtained in a basically balanced manner, and the probability of obtaining the minimum value 0 and the maximum value 10 is less than half.

Math.floor(n); Returns the largest integer less than or equal to n.

When using Math.floor(Math.random()*10);, random integers from 0 to 9 can be obtained evenly.

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javascript advanced tutorial]

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