劉采雨w3SCHOOLS物件object亂數random進位ceil捨去floor

教學影片343

教學影片344

教學影片345

亂數,無條件進位ceil,捨去floor,四捨五入round

劉采雨JavaScript語言Math數學方法(內建函數)

Math.random()亂數Method產生0(含)到7(不含)

Math.floor()無條件捨去Method

Math.ceil()進位Method

Math.round()四捨Method

程式碼

<h1>劉采雨JavaScript語言Math數學方法(內建函數)</h1>

<h2>Math.random()亂數Method產生0(含)到7(不含)</h2>

<p id="demo"></p>

<h2>Math.floor()無條件捨去Method</h2>

<p id="demo1"></p>

<h2>Math.ceil()進位Method</h2>

<p id="demo2"></p>

<h2>Math.round()四捨Method</h2>

<p id="demo3"></p>

<script>

let y = Math.random()*7;

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

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

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

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

</script>