如何在数组的开头和结尾附加一个项目？答案

【问题标题】：How do I attach an item at the beginning and at the end of an Array?如何在数组的开头和结尾附加一个项目？
【发布时间】：2014-06-01 17:06:47
【问题描述】：

我正在创建这样的文本文件：

咖啡：

file = for post in posts
      "#{post.title}\n\n#{post.content}\n\n"

Javascrit：

file = (function() {
  var _i, _len, _results;
  _results = [];
  for (_i = 0, _len = posts.length; _i < _len; _i++) {
    post = posts[_i];
    _results.push("" + post.title + "\n\n" + post.content + "\n\n");
  }
  return _results;
})();

输出如下：

["Chapter 1↵↵<p>As I made my way uphill, I understoo… of the woods, and continued my way uphill.</p>↵↵", "Chapter 2↵↵<p>I hadn't seen An-Mei for nearly six …pths of my heart, waiting to be awoken.</p><br>↵↵", "Chapter 3↵↵<p>"Sure they allow visitors?" I asked …ht?”</p><p>She gave her head another shake.</p>↵↵", "Chapter 4↵↵<p>Back in the hotel, I thought about w…leading the way—we ventured into the woods.</p>↵↵", "Notes↵↵<p>- Search places where only one word can be used &nbsp;</p>↵↵", "Experiment↵↵<p>There was no one in the streets. I … realized it was a fireplace.&nbsp;</p><p>"</p>↵↵", "Untitled↵↵↵↵"]

现在我想将文本文件转换为 HTML 文档，因此我想修改 file 以输出如下内容：

["<html>...", "Chapter 1↵↵<p>As I made my way uphill...]

也许做这样的事情：

file.attachHeader
file.attachFooter

最简单的方法是什么（在 CoffeScript、JS 或 Underscore.js 中）？

【问题讨论】：

标签： javascript arrays coffeescript underscore.js

【解决方案1】：

您可以使用 push 和 unshift。

    var a=["b","c"];
    a.push("d");
    a.unshift("a");
    alert(a);

Example

【讨论】：