方法一:使用 Array.isArray() 方法和 array.length 属性 可以通过 Array.isArray() 方法检查数组是否真的是一个数组,是否存在。如果作为参数传递的 Object 是数组,则此方法返回 true。如果数组未定义或为空,它还会检查大小写。 可以使用 array.length 属性检查数组是否为空。此属性返回数组中元素的数量。如果数字...
isObject(null); if(!Array.isArray) { Array.isArray=function(arg) {returnObject.prototype.toString.call(arg) === '[object Array]'; }; }vararr =newxArray(1,2,3);//[1,2,3]Array.isArray(arr);//true
console.log(checkBoolean(null)); //false console.log(checkBoolean(undefined)); //false console.log(checkBoolean(NaN)); //false console.log(checkBoolean(a));//true console.log(checkBoolean(c));//true javascript中有六种数据类型:string;boolean;Array;Object;null;undefined。如何检测这些数据类型呢...
function unique(arr){ if(!isArrayLink(arr)){ //不是类数组对象 return arr } let result = [] let objarr = [] let obj = Object.create(null) arr.forEach(item => { if(isStatic(item)){ //是除了symbol外的原始数据 let key = item + '_' + getRawType(item); if(!obj[key]){ obj...
classProxySandBox{proxyWindow;isRunning=false;active(){this.isRunning=true;}inactive(){this.isRunning=false;}constructor(){constfakeWindow=Object.create(null);this.proxyWindow=newProxy(fakeWindow,{set:(target,prop,value,receiver)=>{if(this.isRunning){target[prop]=value;}},get:(target,prop,...
name {String} bucket name If bucket is not empty, will throw BucketNotEmptyError. If bucket is not exists, will throw NoSuchBucketError. [options] {Object} optional parameters [timeout] {Number} the operation timeout Success will return:res {Object} response info, including status {Number...
Local<Object> js_options = args[0]->ToObject(env->context()).ToLocalChecked(); ... // options.env Local<Value> env_v = js_options->Get(context, env->env_pairs_string()).ToLocalChecked(); if (!env_v.IsEmpty() && env_v->IsArray()) { ...
blob: a Blob object representing the file to load. source_file_handle: a corresponding file handle for the file, as defined by your system.Sorry for the quirky API. The API is new, and parts of it have not been designed at all. This was just a hack that I came to depend on, ...
Object.is()and===weird cases Object.is()determines if two values have the same value or not. It works similar to the===operator but there are a few weird cases: Object.is(NaN,NaN);// -> trueNaN===NaN;// -> falseObject.is(-0,0);// -> false-0===0;// -> trueObject.is...
userHttpRequestUser | nullObject representing logged-in user, either through Functions authentication, SWA Authentication, or null when no such user is logged in. bodyReadableStream | nullBody as a readable stream. bodyUsedbooleanA boolean indicating if the body is already read. ...