在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(cainiaoplay.com)</title>
</head>
<body>

<p>点击按钮将数组中的所有值乘以特定数字。</p>
<p>乘以: <input type="number" id="multiplyWith" value="10"></p>
<button onclick="numbers.forEach(myFunction)">点我</button>

<p>计算后的值: <span id="demo"></span></p>

<script>
var numbers = [65, 44, 12, 4];

function myFunction(item,index,arr) {
    arr[index] = item * document.getElementById("multiplyWith").value;
    demo.innerHTML = numbers;
}
</script>

</body>
</html>
源代码

动行结果
