【Javascript】乱数～ランダムな数字を出力する～

var randnum = Math.random(); 
console.log(randnum);

出力例
0.87420719877558
0.16926314395231623

var randnum = Math.random()*10; 
console.log(randnum);

出力例
4.8754318842710065
8.9099030485857

var randnum = parseInt(Math.random()*10);
console.log(randnum);

出力例
3
9

var randnum = parseInt(Math.random()*3) + 1; 
console.log(randnum);

var randnum = parseInt(Math.random()*3) + 5; 
console.log(randnum);