Array+push(item)+concat(array)Object+assign(target, ...sources)ES5+ArrayES6+Array+ObjectESNext+Array+Object 对于适配层的实现,可以参考以下代码块,它提供了一个简单的适配器,用于旧版和新版之间的兼容: functionaddObjectToArray(arr,obj){if(Array.isArray(arr)&&typeofobj==='object'){arr.push(obj)...
var arr3=Array.prototype.push.apply(arr1,arr2); document.write(arr3);//6 document.write(arr1);//hello,world,aha!,1,2,3 var arr1=["hello","world","aha!"]; var arr2=[1,2,3]; var arr3=Array.prototype.push.call(arr1,"1","2","3","4"); document.write(arr3);//7 doc...
@stojakovic99 : One hacky way to add an empty item to an array (if we can even call it appending an item to an array, I think a more appropriate term would be resizing) would be: (However you should never ever do this.)const array = [1, 2]; array.length = 3; console.log(...
全部Array的接口可以查看https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Array let nameList = ['Brian', 'Xiang', 'Shuang'];//add item in the lastconst len = nameList.push('Ella'); console.log(nameList, len);//remove item in the lastconst poped =nameList...
-+-返回第一个与给定参数相等的数组元素的索引,没有找到则返回 -1。语法:array.indexOf(item,start),start选填:从下标这(包括该元素)之后的所有元素 1 2 3 letarr = ["aa","bb","cc","dd"] console.log(arr.indexOf("bb"))// 1 console.log(arr.indexOf("bb", 2))// -1 ...
35. Random Array Item Write a JavaScript function to get random items from an array. Click me to see the solution 36. Pre-filled Numeric Array Write a JavaScript function to create a specified number of elements with a pre-filled numeric value array. ...
while(item =list.shift()) {console.log(item)} list// <- [] 5.map() 方法 签名为forEach,.map(fn(value,index,array),thisArgument)。 values= [void0,null,false,'']values[7] =void0result= values.map(function(value,index,array){console.log(va...
Add a new item to an array: constfruits = ["Banana","Orange","Apple","Mango"]; fruits.push("Kiwi"); Try it Yourself » Add two new items to the array: constfruits = ["Banana","Orange","Apple","Mango"]; fruits.push("Kiwi","Lemon"); ...
上面代码中,array.push(…items)和add(…numbers)这两行,都是函数的调用,它们都使用了扩展运算符,该运算将一个数组,变为参数序列。 扩展运算符与正常的函数参数可以结合使用,非常灵活。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 function f(z, x, c, v) {} var args = [0, 1]; f(-1, ...
2.4、数组(Array) ①js中,数组元素类型可以不一致。 ②js中,数组长度可以动态改变。 ③接着上述代码,typeof arr 和 arr instanceof Array 分别输出object和true。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 console.log(typeof(names));//objectconsole.log(namesinstanceofArray);//trueconsole.log(...