const arr = Object.keys(obj).map(key => obj[key]); console.log(arr); // [1, 2, 3] 使用Object.entries()和Array.map() 除了Object.keys()方法,JavaScript中还有一个Object.entries()方法,可以返回一个对象的所有键值对组成的二维数组。我们可以使用这个方法来将对象转换为类似于数组的结构。具体的...
1 Mapping Object to convert object to array 2 map an array from an array of objects key/value 0 How to map an Array to an Object in Javascript? 3 Mapping object to array 2 Map array of objects 0 How to map values from an array to an array of Object? 0 How to map an arr...
if (value instanceofArray){ //对数组执行某些操作} //ECMAScript 5 新增 Array.isArray()方法 if(Array.isArray(value)){ // 对数组执行某些操作} 5.2.2 转换方法 所有对象都具有toLocalString(),toString(),valueOf()方法,其中调用数组的toString()方法返回数组中每个值得字符串形式拼接而成的一个以逗号...
//Object//创建varobj ={}functionobj(){} class obj{}//Array apiArray属性和方法:for条件判断:breakcontinuereturnlet arr= [function(){},newFun(), undefined,null,boolean, string, number, []];varx = arr.length//arr 中元素的数量vary = arr.indexOf('1')//"value" 值的索引值isArray() A...
首先我们准备一个 map 对象,接下来看第一种方式: constobj=Array.from(map).reduce((obj,[key,value])=>Object.assign(obj,{[key]:value}),{})console.log(obj)// { '🏀': 'basketball', '️⚽️': 'soccer', '⚾️': 'baseball', '🎾': 'tennis' } ...
You can do it by iterating over the Map using For-of iteration and pushing the object into a new array. Refer to for-of operation for Map var arr = []; for(var [key, val] of input) { arr.push({ integer: key, letter: val}) } Share Follow answered Dec 22, 2020 at 8:43...
constarr = [...myMap];console.log(arr);// [['foo', 1], ['bar', 2], ['baz', 3]] As you can see, this results in an array of arrays containing key and value from theMapobject. To transform this into an array of objects instead, you can call theArray.prototype.map()method...
JavaScript中可以使用`Array.from`方法从`Map`返回一个数组。 具体步骤如下: 1. 首先,使用`Array.from`方法将`Map`的迭代器转换为一个数组。`Map`的迭...
let map=new Map([['foo','hello'],['bar',100]]); let obj=Object.fromEntries(map); console.log(obj); 1. 2. 3. 4. 5. 6. 7. Object转Array let obj={'foo':'hello','bar':100}; let arr=Object.entries(obj); console.log(arr); ...
constobject={key:'value'} 如果我们想把某个东西转换成一个对象,我们需要传递具有这两个要求的东西:键和值。 满足这些要求的参数有两种类型: 具有嵌套键值对的数组 Map对象 数组 这是一个带有键值对的嵌套数组 constnestedArray=[['key 1','value 1'],['key 2','value 2']] ...