打字稿不运算符不起作用 [英] Typescript not operator not working

问题描述

我具有此功能，该功能在更改设置错误消息可见性的multiselect元素后运行:

I have this function that runs after a multiselect element is changed that sets an error message visibility:

  getVisibility(multiselect) {
    if ((multiselect.selectedCategories.length < 1 && !multiselect.allSelected) && this.submitted) {
      return 'visible'
    } else {
      return 'hidden'
    }
  }

但是在这一行:

if ((multiselect.selectedCategories.length < 1 && !multiselect.allSelected) && this.submitted)

multiselect.allSelected为false，但！multiselect.allSelected也为false.

multiselect.allSelected is false, but !multiselect.allSelected is also false.

图片1:

图片2:

为什么是！ (not)与没有not相同的布尔值?

Why is the ! (not) the same boolean value as without the not?

推荐答案

打字稿无法运行

Typescript not operator not working

最后只是JavaScript，而且绝对可以正常工作. chrome开发工具和/或TypeScript源映射存在问题.

Its just JavaScript in the end and it most definitely works. The issue with the chrome dev tools and / or TypeScript source maps.

我做什么:

• 在控制台中执行命令(可能会撒谎).
• 禁用源地图(更多原因: Chrome Typescript调试参考错误'这个')

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