// loop function demo1() { // before loop beforeLoopCode; for (initCode; conditionCode; stepChangeCode) { loopCode } postCode } // recursive function demo2() { beforeLoopCode; initCode function _m() { if (!conditionCode) { return } loopCode; stepChangeCode; _m() } _m() ...
Statement 3 increases a value (i++) each time the code block in the loop has been executed.Statement 1Normally you will use statement 1 to initiate the variable used in the loop (i = 0).This is not always the case, JavaScript doesn't care. Statement 1 is optional....
The for loop is ideal when you know how many times you want to execute a block of code. It provides more control than while loops for counting iterations. Basic for loopThe following example demonstrates the basic usage of the for loop in JavaScript. main.js ...
If you were careful in watching the code snippets above you will see something that we did not explain: the expressionbreak;. That expression is used to jump out of the loop, which means that it takes the command right after the loop, without executing the rest of it, but instead doing ...
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++) { ...
在前端开发过程中,我们经常使用到JavaScript 提供了很多种循环和迭代的方法,常见for, for…of, for…in, while, Array.forEach, 以及 Array.* (还有一些 Arra...
In JavaScript, the for loop is used for iterating over a block of code a certain number of times, or to iterate over the elements of an array. Here's a quick example of the for loop. You can read the rest of the tutorial for more details. Example for (let i = 0; i < 3; i...
Running the JavaScript code above will result in the following output. Output [ 0 ] [ 0, 1 ] [ 0, 1, 2 ] We set a loop that runs untili < 3is no longertrue, and we’re telling the console to print thearrayExamplearray to the console at the end of each iteration. With this ...
JavaScript for (var i = 0; i <= 4; i++) { console.log(i); } 0 1 2 3 4 See, the output is the same. Apart from this, it's also not necessary to declare the loop variable in the loop's header — it could be declared before as well. For example, the same code above co...
JavaScript for 循环 循环可以将代码块执行指定的次数。 JavaScript 循环 如果您希望一遍又一遍地运行相同的代码,并且每次的值都不同,那么使用循环是很方便的。 我们可以这样输出数组的值: 一般写法: [mycode3 type='js'] document.write(cars[0] + ''); documen