6、删除数组头部元素 let first = fruits.shift()//remove Apple from the front//["Banana"] 7、添加元素到数组的头部 let newLength = fruits.unshift('Strawberry')//add to the front//["Strawberry", "Banana"] 8、找出某个元素在数组中的索引 fruits.push('Mango')//["Strawberry", "Banana", "...
let first = fruits.shift()//remove Apple from the front//["Banana"] 1. 2. 7、添加元素到数组的头部 AI检测代码解析 let newLength = fruits.unshift('Strawberry')//add to the front//["Strawberry", "Banana"] 1. 2. 8、找出某个元素在数组中的索引 AI检测代码解析 fruits.push('Mango')//[...
varfirst=fruits.shift();// remove Apple from the front// ["Banana"]; 1. 2. 添加元素到数组的头部 varnewLength=fruits.unshift('Strawberry')// add to the front// ["Strawberry", "Banana"]; 1. 2. 找出某个元素在数组中的索引 fruits.push('Mango');// ["Strawberry", "Banana", "Mango"...
Array.toString()和Array.toLocaleString();//返回由数组元素组成并由“,”分隔的字符串(不常用);两种方法的区别在于 toLocaleString() 会转变为本地环境字符串(如Date.toLocalString() 会转化为当地时间格式的字符串),toString() 则转为传统字符串; Array 的这两种方法用法无区别; ...
1varnewLength = fruits.unshift('Strawberry')//add to the front2//["Strawberry", "Banana"]; 找出某个元素在数组中的索引 1fruits.push('Mango');2//["Strawberry", "Banana", "Mango"]34varpos = fruits.indexOf('Banana');5//1 通过索引删除某个元素 ...
代码语言:javascript 代码运行次数:0 运行 AI代码解释 /** 队列元素数组 */ final Object[] items; /** 下一个被take,poll,peek,remove的元素位置 */ int takeIndex; /** 插入位置包含put,offer,add */ int putIndex; /** 队列元素的数量 */ int count; /** 重入锁 */ final ReentrantLock lock;...
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addFirst方法 代码语言:javascript 代码运行次数:0 运行 AI代码解释 /** * Inserts the specified element at the front of this deque. * * @param e the element to add * @throws NullPointerException if the specified element is null */ public void addFirst(E e) { if (e == null) throw new...
JavaScript Array splice() Thesplice()method can be used to add new items to an array: Example constfruits = ["Banana","Orange","Apple","Mango"]; fruits.splice(2,0,"Lemon","Kiwi"); Try it Yourself » The first parameter (2) defines the positionwherenew elements should beadded(splic...
varfirst=fruits.shift();// remove Apple from the front// first: "Apple"; fruits: ["Banana"]; 添加元素到数组的头部 varnewLength=fruits.unshift('Strawberry')// add to the front// ["Strawberry", "Banana"]; 找出某个元素在数组中的索引 fruits.push('Mango');// ["Strawberry", "Banana",...