如何在页面重新加载时保持背景颜色变化？

问题描述：

我有一个包含单元格的表格，单击它们会将单元格的背景颜色更改为绿色。但是，当我重新加载页面时，背景颜色会恢复为原始颜色;白色。有什么方法可以阻止它恢复吗？点击它后让它保持绿色？

I have a table which contain cells that when clicked, will change the cell's background color to green. When I reload the page, however, the background color reverts back to its original color; white. Is there any way I can prevent it from reverting? To just keep it green after I clicked it?

JS：

        function eight(){
            var eight = document.getElementById("eight");
            eight.style.backgroundColor = "green";
        }

HTML：

        <td id="eight" onclick="eight(); ">
            <a>8</a>
            <br>
            <center>-</center>
            <br>
            <center>-</center>
            <hr>
            <center>-</center>
            <br>
            <center>-</center>
        </td>

*忽略< td> $ c $内的内容c>标签。

答

您必须将颜色值存储在客户端Cookie 或服务器端会话。现代浏览器也支持 localStorage ..

You have to store the color value in Client side Cookie or Server Side Session. Modern browsers supports localStorage also..

尝试此代码..

function changeBackground() {
        if (sessionStorage.getItem('colour')) {
            document.body.style.backgroundColor = sessionStorage.getItem('colour');
        }else{
            document.body.style.backgroundColor =  "#BB0A21";
            sessionStorage.setItem('colour', "#BB0A21");
        }
    }

  // then you'll need to call your function on page load
  changeBackground();

如何在页面重新加载时保持背景颜色变化？

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