解决办法就是加一个判断 因为这里find()能够拿到正确的数据,所以else语句不会执行,只要返回非undefined且符合我们定义的泛型类型的数据最后得到的结果就不会包含undefined了
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>('save', (next) => { if (!this.createdAt) { this.createdAt = this.updatedAt = new Date() }...
出现错误"Object is possibly 'null‘in typescript“EN在我的typescript文件中，当我试图获取数据时，"...
functionhello(who:string):string{return'Hello, '+who;}functionhelloStartingWith(letter:string):string{constpeople=['Alice','Bob','Carol'];constperson=people.find(name=>name.startsWith(letter));returnhello(person);// This is the error:// Argument of type 'string | undefined' is not assigna...
用watch监听某个一个数组数据,获取其length时,提示Object is possibly ‘null‘ .具体如下: 解决方法如下:就是加null的判断 typescript 提示 Object is possibly ‘null‘ 的N种解决方法 解决方案一 最正确的解决方案,就是加null的判断 const table = document.querySelector('.main-table');if(table) { ...
In Typescript, one common error that developers may encounter is the “Object is possibly null” error. This error typically occurs when trying to access a property or method on an object that could potentially be null or undefined. This article will explain the causes of this error, how to...
typescript 提示 Object is possibly ‘null‘ 的N种解决方法 解决方案一 最正确的解决方案,就是加null的判断 consttable= document.querySelector('.main-table');if(table) {table.setAttribute('height','300px'); } AI代码助手复制代码 解决方案二 ...
TypeScript Version: 2.7.2 Have also reproduced with typescript@next (3.5.0-dev.20190525). Application insights version: 1.0.20 Search Terms: error TS2722 cannot invoke an object which is possibly 'undefined'. typescript error Application...
Object is possibly null: 对象可能是null 分析:localStorage.getItem(“SET_HISTORY_KEY”) 这个值有可能为空,所以再执行getItem就会报错此刻对象可能为空。 解决: 联合类型 把null的情况写入 类型断言成any类型,any类型上访问任何属性和方法都是被允许的。
2366 错误 Function lacks ending return statement and return type does not include 'undefined'. 2368 错误 Type parameter name cannot be '{0}' 类型参数名称不能为“{0}”2369 错误 A parameter property is only allowed in a constructor implementation. 只允许在构造函数实现中使用参数属性。2370 错误 ...