javascript - 编辑文件-纯js

Question

如何在纯 js(无节点)中编辑文件？我得到一个带有输入字段的文件，我这样阅读它的文本:

var fileReader = new FileReader();
fileReader.readAsText(file);

fileReader.onload = function () {
    alert(this.result);
}

所以，非常简单。我试图在网上查看如何使用 fileWriter 但没有成功。我只需要编辑该文件中的文本并保存它，我该怎么做？

Answer 1

可以读入文本文件中的数据，在客户端JavaScript(无Node)中修改，然后输出并重新保存。不过，它确实需要用户交互。

This is a JS fiddle I modified that outputs the file from some text, although it does no reading of files.

最初取自this Stackoverflow question

(function () {
    var textFile = null;
  function makeTextFile(text) {
    var data = new Blob([text], {type: 'text/plain'});

    // If we are replacing a previously generated file we need to
    // manually revoke the object URL to avoid memory leaks.
    if (textFile !== null) {
      window.URL.revokeObjectURL(textFile);
    }

    textFile = window.URL.createObjectURL(data);

    return textFile;
  }


  var create = document.getElementById('create');
  var textbox = document.getElementById('textbox');

    //create a click event listener
  create.addEventListener('click', function () {
    var link = document.getElementById('downloadlink');
    link.setAttribute('download', 'info.txt');
    //make the text file
    link.href = makeTextFile(textbox.value);
    link.style.display = 'block';
        //wait for the link to be rendered and then initiate a click to download the file
     window.requestAnimationFrame(function () {
      var event = new MouseEvent('click');
      link.dispatchEvent(event);
      document.body.removeChild(link);
    });
  }, false);

})();