如何使用javascript将本地文本文件转换为数组并显示其元素

<input type="file" id="fileInput">
<button onclick="readFile()">转换为数组</button>

function readFile() {
  let fileInput = document.getElementById("fileInput");
  let file = fileInput.files[0];

  let reader = new FileReader();
  reader.onload = function(e) {
    let contents = e.target.result;
    let dataArray = contents.split("\n"); // 将文件内容按行分割为数组

    // 显示数组元素
    for (let i = 0; i < dataArray.length; i++) {
      console.log(dataArray[i]);
    }
  };

  reader.readAsText(file);
}