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", "...
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; 6、 Array 排序 Array.reverse...
Copy to index 2, the elements from index 0 to 2: constfruits = ["Banana","Orange","Apple","Mango","Kiwi"]; fruits.copyWithin(2,0,2); Try it Yourself » Note ThecopyWithin()method overwrites the existing values. ThecopyWithin()method does not add items to the array. ...
The push() method can take multiple arguments, each of which will be appended to the array in the order it was passed-in (left-to-right); if you pass push() an array value, however, the array simply gets appended as a single element (a nested array). If you want to append an ar...
To accomplish this, use a wrapping element. 编程方式的 API 我们为所有 Bootstrap 插件提供了纯 JavaScript 方式的 API。所有公开的 API 都是支持单独或链式调用方式,并且返回其所操作的元素集合(注:和jQuery的调用形式一致)。 Copy $('.btn.danger').button('toggle').addClass('fat') 所有方法都可以接受...
Cycles the carousel to a particular frame (0 based, similar to an array). .carousel('prev') Cycles to the previous item. .carousel('next') Cycles to the next item. Events Bootstrap's carousel class exposes two events for hooking into carousel functionality. Both events have the following ...
function map(f, a) { const result = new Array(a.length); for (let i = 0; i < a.length; i++) { result[i] = f(a[i]); } return result; } 在以下代码中,该函数接收由函数表达式定义的函数,并对作为第二个参数接收的数组的每个元素执行该函数: jsCopy to Clipboard function map(f,...
Use the method on any array: varfruits = ["Banana","Orange","Apple","Mango"]; fruits.myUcase(); Try it Yourself » Description prototypeallows you to add new properties and methods to arrays. prototypeis a property available with all JavaScript objects. ...
{// 'unused' is the only place where 'priorThing' is referenced,// but 'unused' never gets invokedif(priorThing) {console.log("hi"); } }; theThing = {longStr:newArray(1000000).join('*'),// Create a 1MB objectsomeMethod:function() {console.log(someMessage); } }; };setInterval...
To accomplish this, use a wrapping element. 编程方式的 API 我们为所有 Bootstrap 插件提供了纯 JavaScript 方式的 API。所有公开的 API 都是支持单独或链式调用方式,并且返回其所操作的元素集合(注:和jQuery的调用形式一致)。 $('.btn.danger').button('toggle').addClass('fat') 所有方法都可以接受一个...