For each element in arr1, we created a key-value pair in the obj object, where the key was the current element (value) and the value was 0. Once the loop was completed, we proceeded to push the obj object into arr2 using the push() method. Finally, we logged arr2 to the console...
catch (error) { const fallbackResponse = await caches.match(fallbackUrl) if (fallbackResponse) { return fallbackResponse } // when even the fallback response is not available, // there is nothing we can do, but we must always // return a Response object return new Response('Network er...
const bObj = new Boolean(false)// valueOf 和 toString 方法console.log(bObj.valueOf()) // falseconsole.log(oObj.toString()) // false// 类型console.log(typeof bObj) // objectconsole.log(typeof false) // boolean// 需要注意的现象console.log(true && bOjb) // true,因为 bObj 是对象,B...
fn(obj[key]) : obj[key]; // If the inverted value does not exist in the accumulator object, initialize it as an empty array. acc[val] = acc[val] || []; // Push the original key into the array associated with the inverted value. acc[val].push(key); return acc; // Return ...
function re-creates a GameState object based on the// plain object that we get from a popstate event.static fromStateObject(stateObject) {let s = new GameState();for(let key of Object. 15.11 网络 每次加载网页时,浏览器都会使用 HTTP 和 HTTPS 协议进行网络请求,获取 HTML 文件以及文件依赖的...
// convert key-value array into url-encoded string urlEncStr = Object.keys( data ).map(function( key ){ return key + "=" + window.encodeURIComponent( data[ key ] ); }).join( "&" ); console.log( urlEncStr ); // bar=bar%20bar&foo=foo%20foo ...
问在JavaScript中合并两个key=value对字符串EN它的工作原理是将重写字符串添加到可重写字符串中，然后...
The first required parameter is the pseudo-array object or iterable object that you want to convert into an array: such as Map and Set, Arguments object The second is an optional mapping function parameter, which can directly enhance the value of the new array, similar to the array map meth...
k= rep[i];v= str(k,value); if (v) { partial.push(quote(k) + ( gap ? ": " : ":" ) + v); } } } } else { // Otherwise, iterate through all of the keys in the object. for (k in value) { if (Object.prototype.hasOwnProperty.call(value, k)) { ...
44. Object from Array with Key Write a JavaScript function to create an object from an array, using the specified key and excluding it from each value. Test Data: indexOn([ { id: 10, name: 'apple' }, { id: 20, name: 'orange' } ], x => x.id) ...