js中Array的map()函数，其中的回调函数还能这么用

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

<p>点击按钮将数组中的每个元素乘于输入框指定的值，并返回新数组。</p>
<p>最小年龄: <input type="number" id="multiplyWith" value="10"></p>
<button onclick="myFunction()">点我</button>
<p>新数组: <span id="demo"></span></p>
<script>
var numbers = [65, 44, 12, 4];
function multiplyArrayElement(num) {
return num * document.getElementById("multiplyWith").value;
}
function myFunction() {
document.getElementById("demo").innerHTML = numbers.map(multiplyArrayElement);
}
</script>

</body>
</html>

点击按钮，输出结果：新数组: 650,440,120,40

posted on 2019-04-29 16:40 2015熊出没阅读(929) 评论(0) 收藏举报