javascript - 如何使用 Javascript 保存 CSS 更改？

Question

我创建了一个页面，人们可以在其中使用 javascript 自行更改背景。但是当我在页面之间切换时，设置消失了。如何仅使用“HTML”、“CSS”和“JAVASCRIPT”来解决这个问题？

这是我的 html 代码:

<input type="image" id="bc-wood-button" src="images/background-wood.jpg" width="213" height="120">
<input type="image" id="bc-nature-button" src="images/background-nature.jpg" width="213" height="120">

这是我的 Javascript:

$(document).ready(function() {
    $('body').css('background-image', 'url("images/background-wood.jpg")');
    document.getElementById("bc-wood-button").addEventListener("click", WoodenBackground);
    document.getElementById("bc-nature-button").addEventListener("click", NatureBackground);

    function WoodenBackground() {
        $('body').css('background-image', 'url("images/background-wood.jpg")');
    }

    function NatureBackground() {
        $('body').css('background-image', 'url("images/background-nature.jpg")');
    }
});

Answer 1

正如评论中的其他建议，您可以使用 localStorage 或 sessionStorage 来保存和加载数据。

$(document).ready(function()
{
  // ulrs of some existing backgrounds          
  var backgrounds = {
    wood: "https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fwww.walldevil.com%2Fwallpapers%2Fa81%2Fwallpapers-dragon-art-yellow-artistic-silver-images-backgrounds-nature-abstract-background-desktop-cool.jpg&f=1",
    nature: "https://images.duckduckgo.com/iu/?u=https%3A%2F%2Fimage.freepik.com%2Ffree-photo%2Fnature-design-with-bokeh-effect_1048-1882.jpg&f=1"
  };

  var settings = loadSettings();
  setBackground(settings.background);  

  document.getElementById("bc-wood-button").addEventListener("click", WoodenBackground);
  document.getElementById("bc-nature-button").addEventListener("click", NatureBackground);

  function setBackground(background) {
    $('body').css('background-image', 'url("'+background+'")');
    localStorage.setItem("settings.background", background);
  }

  function WoodenBackground() {
    setBackground(backgrounds.wood);
  }

  function NatureBackground()
  {
    setBackground(backgrounds.nature);
  }

  function loadSettings() 
  {
    var background = localStorage.getItem("settings.background");
    // at first run there is no data, also user may anytime clear storage
    if (!background) 
    {
      background =  backgrounds.wood;
    }
    return { background: background }
  }
});

jsfiddle