用数组的元素组成字符串 - join() - 在线编辑器

          <p id="demo">点击按钮将数组作为字符串输出。</p>
<button onclick="myFunction()">点我</button>
<script>
  function myFunction() {
    var fruits = ["Banana", "Orange", "Apple", "Mango"];
    var x = document.getElementById("demo");
    x.innerHTML = fruits.join();
  }
</script>
        