download() function: http://qiita.com/ukyo/items/d623209655a003b13add

weblio-word-list-exporter.js

function download(blob, filename) {
  var objectURL = (window.URL || window.webkitURL).createObjectURL(blob),
      a = document.createElement('a');
      e = document.createEvent('MouseEvent');

  //a要素のdownload属性にファイル名を設定
  a.download = filename;
  a.href = objectURL;

  //clickイベントを着火
  e.initEvent("click", true, true, window, 1, 0, 0, 0, 0, false, false, false, false, 0, null);
  a.dispatchEvent(e);
}

var table = []
$(".tngMainT tr:not(:first)").each(function() {
  var e = $(this)
  var word = e.find(".tngMainTTG").text().trim()
  var meaning = e.find(".tngMainTIML").text().trim()
  var exampleE = e.find(".tngMainTSRH").text().trim()
  var exampleJ = e.find(".tngMainTSRFL").text().trim()
  var learned = e.find(".tngMainTMK").find("b:not(.tngMainTLL)"+"[title=learned]").length == 1
  table.push({word: word, meaning: meaning, exampleE: exampleE, exampleJ: exampleJ, learned: learned})
})
console.log(table)

var text = table
  .filter(function(e) { return !e.learned })
  .map(function(e) {
    return (e.learned ? "●" : "○") + " " + e.word + "\n"
      + "  " + e.meaning + "\n"
      + "  " + e.exampleE + "\n"
      + "  " + e.exampleJ + "\n"
  }).join("\n")

console.log(text)
download(new Blob([text]), 'word-list.txt')