如何使用Javascript来读取本地文本文件并逐行阅读？ [英] How to use Javascript to read local text file and read line by line?

问题描述

我有一个由html + javascript制作的网页，这是一个demo，我想知道如何读取本地csv文件并逐行读取，以便从csv文件中提取数据。

I have a web page made by html+javascript which is demo, I want to know how to read a local csv file and read line by line so that I can extract data from the csv file.

推荐答案

没有jQuery：

Without jQuery:

document.getElementById('file').onchange = function(){

  var file = this.files[0];

  var reader = new FileReader();
  reader.onload = function(progressEvent){
    // Entire file
    console.log(this.result);

    // By lines
    var lines = this.result.split('\n');
    for(var line = 0; line < lines.length; line++){
      console.log(lines[line]);
    }
  };
  reader.readAsText(file);
};

HTML：

HTML:

<input type="file" name="file" id="file">

请记住在呈现文件字段后放置JavaScript代码。

Remember to put your javascript code after the file field is rendered.

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