Detailed explanation of JS generating random numbers
Jun 13, 2020 pm 05:22 PM
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 = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'];
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"
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