for (let i = 0; i < 3; i++) { console.log("Hello, world!"); } // Output: // Hello, world! // Hello, world! // Hello, world! Run Code In this example, we used the for loop to print "Hello, world!" three times to the console. JavaScript for loop Syntax The syntax ...
Thefor...ofloop was introduced in the later versions ofJavaScript ES6. Thefor..ofloop in JavaScript allows you to iterate over iterable objects (arrays, sets, maps, strings etc). JavaScript for...of loop The syntax of thefor...ofloop is: for(elementofiterable) {// body of for...of...
For/Of and For/In Loops Thefor/inloop and thefor/ofloop are explained in the next chapter. While Loops Thewhileloop and thedo/whileare explained in the next chapters. Exercise? Consider the following code: let i, x = ''; for (i = 0; i <= 5; i++) { ...
The For In Loop The JavaScriptfor instatement loops through the properties of an Object: Syntax for(keyinobject) { //code block to be executed } Example constperson = {fname:"John", lname:"Doe", age:25}; lettext =""; for(letxinperson) { ...
Syntax You will definitely have to know the syntax offorloops and that goes like this: 1for([initialization]; [condition]; [final-expression]) statement You’ll see in the examples how each of these clauses is translated into code. So let’s start right away. ...
for each in一个类似的但是迭代的是对象的属性的值而不是其属性名字的语句 (过时的) for 迭代器和构造器 (uses thefor...insyntax) Enumerability and ownership of properties Object.getOwnPropertyNames() Object.prototype.hasOwnProperty() Array.prototype.forEach() ...
JavaScript 入门指南(全) 原文:Beginning JavaScript 协议:CC BY-NC-SA 4.0 一、JavaScript 简介 这些年来,avaScript 发生了很大变化。我们目前正处于一个 JavaScript 库的时代,你可以构建任何你想构建的东西。JavaScri
while(n > 1) { // Repeat statements in {} while expr in () is true product *= n; // Shortcut for product = product * n; n--; // Shortcut for n = n - 1 } // End of loop return product; // Return the product
Note that thevarstatement can also appear as part of theforandfor/inloops (introduced inChapter 6), allowing you to succinctly declare the loop variable as part of the loop syntax itself. For example: for(var i = 0; i < 10; i++) document.write(i, ">br<"); for(var i = 0, ...
function walkTree(node) { if (node === null) { return; } // 对节点做些什么 for (let i = 0; i < node.childNodes.length; i++) { walkTree(node.childNodes[i]); } } 跟loop 函数相比,这里每个递归调用都产生了更多的递归调用。将...