AI代码解释 varfruits=["Apple","Banana","Mango","Orange","Papaya"];// Iterates over array elementsfor(vari=0;i<fruits.length;i++){document.write(fruits[i]+"<br>");// Print array element} ECMAScript 6 引入了一种更简单的方法
函数式编程是一种强调和使智能化代码编写的风格,可以最大程度地减少复杂性并增加模块化。这是一种通过巧妙地改变、组合和使用函数来编写更清洁的代码的方式。JavaScript 为这种方法提供了一个极好的媒介。互联网的脚本语言 JavaScript 实际上是一种本质上的函数式语言。通过学习如何暴露它作为函数式语言的真实身份,我们...
if (elements[i].hasAttribute('selected')) {} }如果已知元素存在于一个较小的范围内,1 2 3 4 5 6 var elements = document.getElementById ('canvas').getElementsByTagName('*'); for (i = 0; i < elements.length; i++) { if (elements[i].hasAttribute('selected')) {} }1...
You can use afor..ofloop to iterate over the elements of a string: Example constname ="W3Schools"; for(constx of name) { //code block to be executed } Try it Yourself » Iterating Over an Array You can use afor..ofloop to iterate over the elements of an Array: ...
Set is iterating over its elements in the same order as they were added const set = new Set(); set.add("zero"); set.add("one"); for (let item of set) { console.log(item); } // output: // zero // one Note: WeakSets are not iterable ...
button, input[type="button"] // All and elements 正如您所看到的,CSS 选择器允许我们通过类型、ID、类、属性和文档中的位置引用文档中的元素。querySelector()方法将 CSS 选择器字符串作为其参数,并返回在文档中找到的第一个匹配元素,如果没有匹配项,则返回null: 代码语言:javascript 代码运行次数:0...
A generator is a kind of iterator defined with powerful new ES6 syntax and particularly useful when the values to be iterated are not the elements of a data structure, but the result of a computation. 创建一个生成器,首先要定义一个生成器方法。只需要在function后面加星号即可。调用生成器的时候,...
TheflatMap()method first maps all elements of an array and then creates a new array by flattening the array. Example constmyArr = [1,2,3,4,5,6]; constnewArr = myArr.flatMap((x) => x *2); Try it Yourself » Browser Support ...
function* iterateArrayElements(collection) { for (let element of collection) { yield element; } } 这些函数简洁小巧,易于使用。麻烦的是这些函数中的每一个都会对传入的集合做出判断。它是一个对象数组,每个对象都有一个特定的属性吗?它是一个字符串数组?它是一个对象而不是一个数组?由于这些生成器函数...
functiondisplayElements(arr){// to update the iterationletn =0;return{// implementing the next() functionnext() {if(n < arr.length) {return{value: arr[n++],done:false} }return{value:undefined,done:true} } } }constarr = ['h','e','l','l','o'];constarrIterator = displayElements...