大屏读取本地文件-js读取csv文件之FileReader-526互联

<script>
    function readCsv() {
      const file = document.getElementById('uploadFile').files[0];
      if (file.type != "text/csv") {
        alert("文件类型错误");
        return;
      }
      var reader = new FileReader();
      const data = [];
      reader.onload = function () {
        const result = reader.result;
        let lines = result.split("\r\n");
        lines.map(function (item, index) {
          let line = item.split(",");        
            data.push(line);   
        });
        console.log(data);
      };
      reader.readAsText(file);
    }
  </script>
  <body>
    <input type="file" name="file" id="uploadFile" onchange="readCsv(this);" />
  </body>

文件读出来是数组

文件