console.log(typeofnum1);//numberconsole.log(typeofstr1,);//stringconsole.log(typeofisTrue);//booleanconsole.log(typeofundefinedVar);//undefinedconsole.log(typeofnullVar);//objectconsole.log(typeofsymbol1);//symbolconsole.log(typeofbigIntNum);//bigintconsole.log(typeofnotANumber);//number...
functionuseRef<T>(initialValue: T|null): RefObject<T>;//convenience overload for potentially undefined initialValue / call with 0 arguments//has a default to stop it from defaulting to {} instead/** * `useRef` returns a mutable ref object whose `.current` property is initialized to the pa...
这样做之后,我运行了npm run build,显示了许多由于严格模式类型检查而需要修复的错误。 这些错误中的许多是相当简单的,例如TS2531: Object is possibly 'null'。这只是对 null 做了一个检查,以确保在不期望的情况下不使用 null 值。其他的错误,例如TS2564: Property 'minimapWrapper' has no initializer and is ...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 "use strict";var__importStar=(this&&this.__importStar)||function(mod){if(mod&&mod.__esModule)returnmod;varresult={};if(mod!=null)for(varkinmod)if(Object.hasOwnProperty.call(mod,k))result[k]=mod[k];result["default"]=mod;returnresul...
if (mod && mod.__esModule) return mod; var result = {}; if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k]; result["default"] = mod; return result; } var __importDefault = (this && this.__importDefault) || function (mod...
"use strict";var__importStar=(this&&this.__importStar)||function(mod){if(mod&&mod.__esModule)returnmod;varresult={};if(mod!=null)for(varkinmod)if(Object.hasOwnProperty.call(mod,k))result[k]=mod[k];result["default"]=mod;returnresult;};Object.defineProperty(exports,"__esModule",{va...
}letres: CallResult = some_api_function('hello','world');if(!res.succeeded()) {console.log('Call failed: '+ res.errorMessage()); } any类型在TypeScript中并不常见,只有大约1%的TypeScript代码库使用。一些代码检查工具(例如ESLint)也制定一系列规则来禁止使用any。因此,虽然禁止any将导致代码重构,...
if (err) { return null; } console.log(content.toString()); }); 复制代码 1. 2. 3. 4. 5. 6. 7. 8. 前面提到的fs模块告诉工作池使用其中一个线程来读取文件的内容,并在完成后通知事件循环。然后事件循环获取提供的回调函数,并用文件的内容执行它。
Map.groupByis similar, but produces aMapinstead of a plain object. This might be more desirable if you need the guarantees ofMaps, you’re dealing with APIs that expectMaps, or you need to use any kind of key for grouping – not just keys that can be used as property names in JavaScri...
if (!Regexp.Phone.test(form.phone)) { return Message.warning('请输入正确手机号格式') } } </script> 页面模板CSS类名采用半角连接符(-) <template> <div class="detail"> <h3 class="title">标题</h3> <section class="table-box">