通过组合字符串 & 来创建新的 JavaScript 变量多变的 [英] Make new JavaScript variable by combining string & variable

问题描述

所以这是我的问题.

pageTitle1 = ('This is page one');
pageTitle2 = ('This is page two');
pageTitle3 = ('This is page three');

currentPageTitle = ('pageTitle'+currentPosition);

$("#pageNumber").html(currentPageTitle);

我正在尝试根据我所在幻灯片的 currentPosition 在屏幕上显示当前页面标题.我遇到的问题是当我需要它显示这是第一页"时，上面的代码在屏幕上显示pageTitle1".我是 javascript 新手，所以我觉得这是一个简单的解决方案，但几天的谷歌搜索并没有给我带来任何好处.

I'm trying to display the current page title to the screen based on the currentPosition of the slide I am on. The issue I'm having is the code above is displaying "pageTitle1" to the screen when I need it to display "This is page one". I'm newish to javascript so I have a feeling this an easy fix but days of googling has yielded me nothing.

推荐答案

使用数组而不是单独命名每个变量.

Use an array instead of naming each variable individually.

var pageTitles = [
 'This is page one',
 'This is page two',
 'This is page three'
];

var currentPageTitle = pageTitles[currentPosition];

您的代码不工作的原因是因为它只是简单地添加了两个字符串 "pageTitle" 和 currentPosition 并将连接后的字符串分配给 currentPageTitle.您想要的是获取存储在具有该名称的变量中的值.假设您在全局范围内创建这些(顺便说一句，这不是一件好事)，您可以这样做:

Reason why your code is not working is because it is simply adding the two strings "pageTitle" and currentPosition and assigning the concatenated string to currentPageTitle. What you instead want is to get the value stored in the variable having that name. Assuming you are creating these in the global scope (which is not a good thing btw), you can do:

var currentPageTitle = window['pageTitle'+currentPosition];

然而，使用数组是更好的方法.

However, going with arrays is a better approach.

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