謝孜妤JavaScript亂數random捨去小數floor進位ceil四捨五入round

343,344,345,346影片

財金程式設計346乙班RANDOM,FLOOR,CEIL,ROUND

介紹物件object

344亂數RANDOM無條件捨去小數FLOOR

a

輸入整數<input typt="number" min=1 max=1000/>

<button onclick="abc()">謝孜妤執行</button>

<h3>Math.random()亂數Method方法</h3><p id="demo"></p>

<h3>Math.floor()捨去小數Method方法</h3><p id="demo1"></p>

<h3>Math.ceil()進位Method方法</h3><p id="demo2"></p>

<h3>Math.round()四捨五入Method方法</h3><p id="demo3"></p>

<script>

function abc(){

let n=document.getElementById("n").value;

let x=Math.random()*n;

document.getElementById("demo").innerHTML =x;

document.getElementById("demo1").innerHTML=Math.floor(x);

document.getElementById("demo2").innerHTML=Math.ceil(x);

document.getElementById("demo3").innerHTML=Math.round(x);}

</script>