一些原生方法,比如String.prototype.match(),可以返回null来表示丢失的对象。看看下面的示例: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 letarray=null;array;// => nullletmovie={name:'Starship Troopers',musicBy:null};movie.musicBy;// => null'abc'.match(/[0-9]/);// => null 由于JS ...
Isolate* isolate, Handle<Map> map, int enum_length, AllocationType allocation = AllocationType::kOld); Handle<FixedArray> FastKeyAccumulator::InitializeFastPropertyEnumCache( Isolate* isolate, Handle<Map> map, int enum_length,...
// generator执行器 // 如果ret.done,返回ret.value // 否则, function next(ret) { // 如果执行完成,直接调用resolve把promise置为成功状态 if (ret.done) return resolve(ret.value); // 把yield的值转换成promise // 支持 promise,generator,generatorFunction,array,object // toPromise的实现可以先不管,...
1typeWorkerCallback=(err:any,result?:any)=>any;23exportfunctionrunWorker(path:string,cb:WorkerCallback,workerData:object|null=null){4constworker=newWorker(path,{workerData});56worker.on('message',cb.bind(null,null));7worker.on('error',cb);89worker.on('exit',(exitCode)=>{10if(exitCod...
It enables some transformations that might break code logic in certain contrived cases, but should be fine for most code. You might want to try it on your own code, it should reduce the minified size. Here's what happens when this flag is on: new Array(1, 2, 3) or Array(1, 2, ...
jobId: number | string - Override the job ID - by default, the job ID is a unique integer, but you can use this setting to override it. If you use this option, it is up to you to ensure the jobId is unique. If you attempt to add a job with an id that already exists, it ...
TypeError: Cannot read property 'not' of undefined at Object.fooSerializer [as foo] (/Users/trentm/tm/node-bunyan/bar.js:8:26) at /Users/trentm/tm/node-bunyan/lib/bunyan.js:873:50 at Array.forEach (native) at Logger._applySerializers (/Users/trentm/tm/node-bunyan/lib/bunyan.js:...
afterstring or array[]Like 'before', but adds a page-break immediately after the element. avoidstring or array[]Like 'before', but avoids page-breaks on these elements. You can enable this feature on every element using the 'avoid-all' mode. ...
**注意:**ES5 版本对许多 polyfill 都具有隐式依赖,而 exceljs 不再明确添加。 您需要在依赖项中添加core-js和regenerator-runtime,并在导入exceljs之前在代码中包含以下引用: // exceljs 所需的 polyfillsrequire('core-js/modules/es.promise');require('core-js/modules/es.string.includes');require('core...
The path can be provided as a dot-separated string or as an array of strings. That is, the following two calls are equivalent: span.annotate('sdk.custom.tags.myTag', 'My Value'), and span.annotate(['sdk', 'custom', 'tags', 'myTag'], 'My Value'). span.annotate(['sdk', '...