record.childList1?.[0]?.pciName The first ?.[0] is used because childList1 may be undefined. The second ?.pciName is used because even if childList1 is an array, it may be empty and [0] could also be undefined. But why is childList1 an array if you're only interested in t...
// Cannot invoke an object which is possibly 'undefined'.(2722) const num1 = numGenerator(); // Error const num2 = numGenerator!(); //OK } 因为!非空断言操作符会从编译生成的 JavaScript 代码中移除,所以在实际使用的过程中,要特别注意。比如下面这个例子: const a: number | undefined = unde...
// Object is possibly 'undefined'.(2532) // Cannot invoke an object which is possibly 'undefined'.(2722) constnum1 = numGenerator;// Error constnum2 = numGenerator!;//OK } 因为! 非空断言操作符会从编译生成的 Java 代码中移除,所以在实际使用的过程中,要特别注意。比如下面这个例子: consta:...
type NumGenerator = () => number;functionmyFunc(numGenerator: NumGenerator | undefined) {// Objectispossibly'undefined'.(2532)// Cannot invoke an object whichispossibly'undefined'.(2722)const num1 = numGenerator(); // Errorconst num2 = numGenerator!(); //OK} 1. 2. 3. 4. 5. 6. ...
1.2 调用函数时忽略 undefined 类型 代码语言:javascript 复制 typeNumGenerator=()=>number;functionmyFunc(numGenerator:NumGenerator|undefined){// Object is possibly 'undefined'.(2532)// Cannot invoke an object which is possibly 'undefined'.(2722)constnum1=numGenerator();// Errorconstnum2=numGenerator...
// 这里 Error对象定义的stack是可选参数,如果这样写的话编译器会提示 // 出错 TS2532: Object is possibly 'undefined'. return new Error().stack.split('\n'); // 我们可以添加?操作符,当stack属性存在时,调用 stack.split。 // 若stack不存在,则返回空 return new Error().stack?.split('\n');...
TS2532: Object is possibly 'undefined' inside an array Ask Question Asked 1 year, 7 months ago Modified 1 year, 7 months ago Viewed 928 times Report this ad1 I'm beginning my path in Typescript and got a problem that i can solve. I'm trying to acess one index of one array inside...
const foo: string | null | undefined = undefined; // 不开启 compilerOptions.strictNullChecks ,不会有编译时错误,但是运行时会出现异常(Cannot read properties of undefined ) // 开启 compilerOptions.strictNullChecks,会出现编译时错误(Object is possibly 'undefined') ...
Object is possibly 'undefined'.ts 449 0 2 老师你好,add1类型是Object、object、Function的时候都可以将sum进行赋值是为什么呢 489 0 4 TypeError: 'CClass' object is not callabl 1674 0 1 failure: str object is not callable 937 0 6 TypeError: 'int' object is not callable 1155 0...
2531 错误 Object is possibly 'null'. 2532 错误 Object is possibly 'undefined'. 2533 错误 Object is possibly 'null' or 'undefined'. 2534 错误 A function returning 'never' cannot have a reachable end point. 2535 错误 Enum type '{0}' has members with initializers that are not literals. ...