是ts编译器在编译时诊断到document.getElementById('test')可能会为null,所以给出了这样一个提示:对象可能为null,解决方式是这样: java document.getElementById('test')!.innerHTML = greeter(user); 加一个!,感叹号什么意思呢,它其实是not null 的断言操作符,不执行运行时检查,告诉编译器只需要知道这个东西 _...
是ts编译器在编译时诊断到document.getElementById('test')可能会为null,所以给出了这样一个提示:对象可能为null,解决方式是这样: document.getElementById('test')!.innerHTML = greeter(user); 1. 加一个!,感叹号什么意思呢,它其实是not null 的断言操作符,不执行运行时检查,告诉编译器只需要知道这个东西...
这段代码是报错的。 viewCountTemp.match(/.*\((.*)\)/) error TS2531: Object is possibly 'null'. 解决方案: 在这个对象后面加一个感叹号 ! ==> 是not null 的断言操作符,不执行运行时检查,告诉编译器只需要知道这个东西 infoItem.viewCount =parseInt(viewCountTemp.match(/.*\((.*)\)/)![1])...
interfaceUser{name:string;}functionisUser(value:unknown):valueisUser{returntypeofvalue==='object'&&Boolean(value)&&('name'invalue);} Also "Object is possibly 'null'.(2531)" error can be caused by using the following expressions: returnBoolean(value)&&typeofvalue==='object'&&('name'invalue)...
(2531) orangiss/juzimi.ts (294,17): Object is possibly 'null'. (2531) orangiss/juzimi.ts: Emit skipped at getOutput (/Users/lijiarui/git/wechaty/node_modules/ts-node/src/index.ts:308:17) at /Users/lijiarui/git/wechaty/node_modules/ts-node/src/index.ts:334:18 at Object....
解决typescript:errorTS2531: Object is possibly 'null'.问题 原因是什么呢?是ts编译器在编译时诊断到document.getElementById('test')可能会为null,所以给出了这样一个提示:对象可能为null,解决方式是这样: document.getElementById('test')!.innerHTML = greeter(user); ...
Below is an example of how an error can occur. import {useEffect, useRef} from 'react'; export default function App() { const inputRef = useRef<HTMLInputElement>(null); useEffect(() => { // ⛔️ Object is possibly 'null'.ts(2531) ...
The error "Object is possibly 'null'" occurs when we try to access a property on an object that may have a value of `null`.
The "Object is possibly null" error is caused because theuseRef()hook can be passed an initial value as an argument and we're passing itnullas an initial value. The hook returns a mutable ref object whose.currentproperty is initialized to the passed argument. ...
2019-12-22 19:40 −因为Spring-Security从4+升级到5+,导致There is no PasswordEncoder mapped for the id “null”错误。 解决方案: 1.可在密码验证类中添加 @Bean public static NoOpPasswordEn... 素颜~ 0 1199 JSON parse error: syntax error, expect {, actual error, pos 0, fastjson-version ...