<!DOCTYPE html>
<html>
<head>
<meta charset=”utf-8″>
<title>菜鸟教程(runoob.com)</title>
</head>
<body>
<p>点击按钮列出数组的每个元素。</p>
<button onclick=”numbers.forEach(myFunction)”>点我</button>
<p id=”demo”></p>
<script>
demoP = document.getElementById(“demo”);
var numbers = [4, 9, 16, 25];
function myFunction(item, index) {
demoP.innerHTML = demoP.innerHTML + “index[” + index + “]: ” + item + “<br>”;
}
</script>