在 React 中连接变量和字符串 [英] Concatenating variables and strings in React

问题描述

有没有办法结合 React 的花括号符号和 href 标签?假设我们在状态中有以下值:

Is there a way to incorporate React's curly brace notation and an href tag? Say we have the following value in the state:

{this.state.id}

以及标签上的以下 HTML 属性:

and the following HTML attributes on a tag:

href="#demo1"
id="demo1"

有没有一种方法可以将 id 状态添加到 HTML 属性中以获得如下内容:

Is there a way I can add the id state to the HTML attribute to get something like this:

href={"#demo + {this.state.id}"}

哪个会产生:

#demo1

推荐答案

你几乎是对的，只是放错了几个引号.用正则引号将整个内容括起来实际上会给你字符串 #demo + {this.state.id} - 你需要指出哪些是变量，哪些是字符串文字.由于 {} 中的任何内容都是内联 JSX 表达式，您可以执行以下操作:

You're almost correct, just misplaced a few quotes. Wrapping the whole thing in regular quotes will literally give you the string #demo + {this.state.id} - you need to indicate which are variables and which are string literals. Since anything inside {} is an inline JSX expression, you can do:

href={"#demo" + this.state.id}

这将使用字符串文字 #demo 并将其连接到 this.state.id 的值.然后这可以应用于所有字符串.考虑一下:

This will use the string literal #demo and concatenate it to the value of this.state.id. This can then be applied to all strings. Consider this:

var text = "world";

还有这个:

{"Hello " + text + " Andrew"}

这将产生:

Hello world Andrew 

您还可以使用 ES6 字符串插值/模板文字 带有 `(反引号)和 ${expr}(插值表达式)，这更接近于您似乎想要做的事情:

You can also use ES6 string interpolation/template literals with ` (backticks) and ${expr} (interpolated expression), which is closer to what you seem to be trying to do:

href={`#demo${this.state.id}`}

这将基本上替换this.state.id 的值，将其连接到#demo.相当于做:"#demo" + this.state.id.

This will basically substitute the value of this.state.id, concatenating it to #demo. It is equivalent to doing: "#demo" + this.state.id.

这篇关于在 React 中连接变量和字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！