function getLastElementChild(obj){ if(obj.lastElementChild != undefined){ return obj.lastElementChild; }else{ var nodeLast = obj.lastChild; while(nodeLast && nodeLast.nodeType != 1){ nodeLast = nodeLast.previousSibling; } return nodeLast; } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10...
The pop() method modifies the length of the array and removes and returns the last element of the array. let numbers = [1, 3, 5, 7, 9, 11, 13, 15]; let lastElement = numbers.pop(); console.log(lastElement); //Output: 15Code language: JavaScript (javascript) The length of the...
Array对象允许在一个变量中存储多个值。它存储相同类型元素的固定大小的顺序集合。数组用于存储数据集合,但将数组看作同一类型变量的集合通常更有用。本文主要介绍JavaScript(JS) array.lastIndexOf(searchElement[, fromIndex]) 方法。 原文地址:JavaScript(JS) array.lastIndexOf(searchElement[, fromIndex])...
"banana", "orange", "grape"]constlastElement=fruits.pop();// 删除并返回数组中的最后一个元素console.log(lastElement);// 输出 "grape"console.log(fruits);// 输出 ["apple", "banana", "orange"]constfirstElement
创建一个新的数组,其中每一个元素由调用数组中的每一个元素执行提供的函数得来(creates a new array with the results of calling a provided function on every element in the calling array)。map 方法会给原数组中的每个元素都按顺序调用一次 callback 函数。callback 每次执行后的返回值(包括 undefined)组合...
用法:arr.includes(searchElement, [fromIndex]) searchElement(必需):要查找的元素 fromIndex(可选):从该索引处开始查找searchElement,如果为负值,则按升序从 array.length + fromIndex 的索引开始搜索。默认为 0。 vararr = [1,2,3,4,5,5];//判断arr数组是否包含了 2vararr1 = arr.includes(2);//从索...
Array对象允许在一个变量中存储多个值。它存储相同类型元素的固定大小的顺序集合。数组用于存储数据集合,但将数组看作同一类型变量的集合通常更有用。本文主要介绍JavaScript(JS) array.unshift( element1, ..., …
The findLast() method does not change the original array.Array Find Methods: MethodFinds indexOf() The index of the first element with a specified value lastIndexOf() The index of the last element with a specified value find() The value of the first element that passes a test findIndex...
varmyArray=[1,2,3,4,5,6];// Fastest method, requires the array is in a variablemyArray[myArray.length-1];// Also very fast but it will remove the element from the array also, this may or may not matter in your case.myArray.pop();// Slowest but very readable and doesn't req...
❮PreviousJavaScript ArrayReferenceNext❯ Example 1 Find the last element with a value over 18: constages = [3,10,18,20]; ages.findLastIndex(checkAge); functioncheckAge(age) { returnage >18; } Try it Yourself » Description