Often statement 2 is used to evaluate the condition of the initial variable.This is not always the case, JavaScript doesn't care. Statement 2 is also optional.If statement 2 returns true, the loop will start over again, if it returns false, the loop will end....
you would be building an infinite loop. But if this is not your intention then you will have to put a condition and an expression that changes the value of the variable, as we have done in the
loop 关键字告诉 Rust 一遍又一遍地执行一段代码直到你明确要求停止。Rust 提供了一种从代码中跳出循环的方法。loop 循环,相当于一个 while true,需要程序自己 break: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 fnmain(){letmut counter=0;letresult=loop{counter+=1;ifcounter==10{breakcounter*2;}...
同样,您必须使用 break 语句来终止循环,并修改 counter 变量以使 break 语句的条件在某个时刻变为true。 // initialize j variableletj =1;for(;;) {// terminate the loop if j is greater than 10;if(j >10)break;console.log(...
The for keyword creates a loop that consists of three parts: initialization, condition, and final expression. It's one of the most commonly used loop structures in JavaScript. The loop continues until the condition evaluates to false. The initialization is executed once before the loop starts. ...
JavaScript for loop Syntax The syntax of the for loop is: for (initialExpression; condition; updateExpression) { // for loop body } Here, initialExpression - Initializes a counter variable. condition - The condition to be evaluated. If true, the body of the for loop is executed. updateExp...
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 ...
This is required per se, for if we use var twice (with a semicolon (;) in between the statements), the second var statement would be treated as the loop's condition (since it comes after the first semicolon), ultimately leading to an error. Here's an illustration JavaScript var nums...
JavaScript的循环语句 01)for语句 for循环是一种前测试循环语句,但它具有在执行循环之前初始化变量和定义循环后要执行的代码的能力。以下是for循环的语法: 初始化表达式,控制表达式,循环后表达式 for(initialization;expression;post-loop-expression){ //loop option...
JavaScript supports different kinds of loops: for- loops through a block of code a number of times for/in- loops through the properties of an object for/of- loops through the values of an iterable object while- loops through a block of code while a specified condition is true ...