转换数组到字符串 -toString() - 在线编辑器

          <p id="demo">点击按钮将数组转为字符串并返回。</p>
<button onclick="myFunction()">点我</button>
<script>
  function myFunction() {
    var fruits = ["Banana", "Orange", "Apple", "Mango"];
    var str = fruits.toString();
    var x = document.getElementById("demo");
    x.innerHTML = str;
  }
</script>
        