在Switch案例声明中出现重复的Const声明错误 [英] Error Duplicate Const Declaration in Switch Case Statement

问题描述

我有以下代码，我收到错误'Duplicate Declaration query_url'。

I have the following code and I get the error 'Duplicate Declaration query_url'.

  switch(condition) {
    case 'complex':
      const query_url = `something`;
      break;
    default:
      const query_url = `something`;
      break;
  }

我知道query_url正在声明两次是不对的。但我不知道如何解决这个问题。有人可以帮助您做出正确的方法吗？

I understand that query_url is getting declared twice which isn't right. But i don't know how to resolve this. Can someone please help on what should be the correct way to make this work?

推荐答案

if query_url 可以有多个值，具体取决于交换机分支显然需要一个变量（声明为$ code> var 或 let ）。

if query_url can have multiple values depending on the switch branch obviously you need a variable ( declare either with var or let ).

const设置一次并保持这种方式。

const is set once and stays that way.

p>

example usage with let

let query_url = '';
switch(condition) {
  case 'complex':
    query_url = `something`;
    break;
  default:
    query_url = `something`;
    break;
}

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