Object is possibly 'undefined' 在开发项目过程中,本来已经定义了一个对象,里面是有值的,但是vscode一直报错,提示如下所示: Objectispossibly'undefined' 虽然报错,但是页面和功能是正常的,只是很烦恼不想看到报红,那么应该如何解决呢? 这就涉及到Typescript里类型推断的知识点,当前只是遇到这个问题,那先学用到的就...
解决方案:加类型断言 (this.toolsasArray<any>).forEach(item=>{console.log(item.id);})
If you are mapping over this.props.params, and it may be undefined at some point, you need to include a conditional in the assignment of your menuJSX variable to account for when menuCodes.menuItems (and thus props.params) is undefined. Something like this ternary: const { params } = t...
this.createdAt ??= this.updatedAt = new Date() zz-james commented Nov 18, 2021 • edited I think the problem is that arrow functions don't have a 'this' try using an old school function definition? this remains an issue TS2532: Object is possibly 'undefined'. @pre<RoleEntity>('...
(be very careful doing this as code in between the .set and .get could change/delete that item) handle the possibility of the item being undefined and act accordingly const myMap = new Map<string, number>(); myMap.set('test', 1); // Object is possibly 'undefined'. const...
cannot invoke an object which is possibly undefined. 在编程过程中,我们经常会遇到一个类似于“无法调用可能未定义的对象”的警告信息,通常被表示为#undefined。这个警告信息告诉我们,在代码中可能存在一个对象,但在当前情况下并未定义或尚未初始化。这种情况可能导致程序在运行时出现未知的行为或错误。
如图,编译时报了bject is possibly 'undefined的错。确实我的obj打印出来是undefined,但是这个方法其实是有的,if下面是走得通的。但是因为构建用了fix规范,以至于会一直报错。百度搜了是ts的问题,然后在ts的compilerOptions里面把 "strict": false,确实不报错了,但是担心统一改成 false会影响项目,因此求问大佬有没有...
这个警告通常被称为 "cannot invoke an object which is possibly undefined",意思是“可能未定义的对象,无法调用”。 这个警告的意义在于提醒我们,在编写代码时,需要确保函数的定义与上下文相符,以避免产生编译错误。 那么,我们该如何解决这个问题呢? 首先,我们需要明确一点:这个警告并不意味着函数一定没有定义。它只...
Report this ad 9 I've been searching for a while, and found similiar problems on the web, but none of the solutions seems to work for me. I'm using typescript in my react proj for the very first time, and I'm having an error: Object is possibly 'undefined' I've been trying...