列出数组的每个元素

<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>