附加到二维数组的Javascript [英] Javascript Appending to 2-D Array

问题描述

我正在尝试将数组追加到数组。我期望输出为：

I am trying to append an array to an array. I am expecting the output to be something like:

[[Dep，POR]，[14073,99.25]，[14072,0.06]]

但是我得到：

Dep,POR,14073,99.25,14072,0.06

这是我到目前为止的内容：

Here's what I have so far:

  function get_historical() {
    var well = document.getElementById('wellSelect'); 
    var selected_well = well.options[well.selectedIndex].value; 
    var hist_json_obj = JSON.parse(Get("/get_historical/" + selected_well));
    hist_por = ['Dep','POR'];
    for (var item in hist_json_obj) {
      if (hist_json_obj.hasOwnProperty(item)) {
         var dep = hist_json_obj[item].dep;
         var por = hist_json_obj[item].por;

         var arr_por = [dep, parseFloat(por)];
         hist_por.push(arr_por);

      }
    }
    document.write(hist_por);
  }

推荐答案

初始化 hist_por ，您希望它是一个二维数组，而您目前只有一个数组。因此，您希望将其实例化为：

When you initialize hist_por, you want that to be a 2-D array whereas you currently have just a single array. So you would want to change its instantiation to:

hist_por = [['Dep','POR']]; // [[ ... ]] instead of [ ... ]

也按@justrusty的回答，将其传递给 document.write（）时，需要 JSON.stringify（hist_por）。这是更重要的部分，因此他的回答应该被接受。

Also per @justrusty's answer, you need to JSON.stringify(hist_por) when you pass it to document.write(). This is the more important piece so his answer should be accepted.

因此整个代码块将变为：

So the whole code block would become:

function get_historical() {
  var well = document.getElementById('wellSelect'); 
  var selected_well = well.options[well.selectedIndex].value; 
  var hist_json_obj = JSON.parse(Get("/get_historical/" + selected_well));
  hist_por = [['Dep','POR']];
  for (var item in hist_json_obj) {
    if (hist_json_obj.hasOwnProperty(item)) {
       var dep = hist_json_obj[item].dep;
       var por = hist_json_obj[item].por;

       var arr_rop = [dep, parseFloat(por)];
       hist_por.push(arr_por);

    }
  }
  document.write(JSON.stringify(hist_por));
}

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