onChangeFunc.js

  onChange(files){
    const f = files[0];
    var reader = new FileReader();
    reader.onload = (function(theFile) {
      return function(e) {
        const data = e.target.result;
        const lines = data.split("\n");
        const headers = lines[0].split(",");
        lines.shift();
        const result = [];
        for (let i = 0; i < lines.length; i++) {
          const lineData = lines[i].split(",");
          const obj = {};
          for (let j = 0; j < headers.length; j++) {
            obj[headers[j]] = lineData[j];
          }
          result.push(obj);
        }
        console.log(result);
      };
    })(f);
    reader.readAsText(f);
  }