Question

以下代码具有一个名为additionalData的数组，据认为该数组已填充数据。

如果我打印数组的长度，它将显示为0，这与我只是将数组本身记录到控制台工具中时所显示的信息形成鲜明对比，在控制台工具中可以按预期看到所有数据。如果我尝试显示示例元素，它也会显示为undefined。

也许对数组有更多帮助：

其内容类似于[ ["<a href=...> ... </a>"] , [...], ...]

这是浏览器控制台显示的数组本身：

[]

0: Array [ "<a href=https://www.openstreetmap.org/search?query=76139 Karlsruhe - Hagsfeld#map=12/49.0159/8.4097> 76139 Karlsruhe - Hagsfeld </a>" ]

1: Array [ "<a href=https://www.openstreetmap.org/search?query=nähe Bahnhof 75053 Gondelsheim -#map=12/49.0159/8.4097> nähe Bahnhof 75053 Gondelsheim - </a>" ]

....

39: Array [ "<a href=https://www.openstreetmap.org/search?query=Kirschstr. 17 76189 Karlsruhe - Daxlanden#map=12/49.0159/8.4097> Kirschstr. 17 76189 Karlsruhe - Daxlanden </a>" ]

length: 40

<prototype>: Array []

// ==UserScript==
// @name     Table to CSV
// @version  1
// @grant    none
// @require https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js
// @require https://raw.githubusercontent.com/Toorero/table2CSV/master/table2CSV.js
// ==/UserScript==




function extractData(website_data) {

  //get Node under which the adress is written
  var node = $("b", website_data).filter( function (i, elem) {
    return elem.innerText == "Standort:"
  })[0].nextSibling;

  //get the adress text (until next section => adress)
  var addr_text = "";
  do {
    if(node.nodeName == "BR") addr_text +=" ";
    else addr_text += node.textContent;
    node = node.nextSibling;

  } while (node.nodeName != "TABLE" && node.nodeName != "DIV")

  addr_text = addr_text.replace("keine Angabe", "").trim();
  const addr = `<a href=https://www.openstreetmap.org/search?query=${addr_text}#map=12/49.0159/8.4097> ${addr_text} </a>`;

  return [addr];

}


$(document).ready(function () {
  //get Data by following each link
  var additionalData = [];
  $("td > a").each(
    function() {
      $.get(this.search, function(data, status){ additionalData.push(extractData(data)) });
      console.log('data from "' + this.search + '" retrieved!');
    }
  );

  console.log(additionalData.length); // 0
  console.log(additionalData); //displayed as expected

  console.log(additionalData[4]); //undefined


  console.log(additionalData[4]);

  //add <td> element boundaries for collected data
  const additionalColumns = additionalData.map( // <-- does not work because of the failure above
    function(data) {
      var r="";
      for(x of data) {
        r += `<td> ${r} </td>`;
      }

      console.log(r);

      return r;
    }
  );

  console.log(additionalColumns);    

  //insert the collected data
  $(additionalColumns).insertAfter($("td > a").parent());

  console.log("Inserted collected data!");


});

具有内容的数组的长度为0

0 个答案: