JS 中常见的循环有for、 while,和do...while ,它们用于执行重复任务,比如遍历项目列表。例如,如果我们要打印 100 个学生的成绩,我们可以通过编写 100 次来调用 PrintResult(rollNum) 函数 100 次,或者我们可以创建一个循环,从 1 迭代到 100 并调用函数PrintResult (rollNum),如下所示。 j
Try it yourself » The While Loop The while loop and the do/while loop will be explained in the next chapter. Test Yourself with Exercises! Exercise 1 »Exercise 2 »Exercise 3 »Exercise 4 »Exercise 5 »Exercise 6 »
Use data types and operators to do logic and calculations. Organize and reuse code by functions. Conditions, like "if" and "else," let you control how a program runs. Learn how to use them. Use loops (like for and while) to do things over and over again. Learn how to use Document...
Understanding the do-while loop Using the for loop Using the forEach statement Understanding the break statement Understanding the continue statement Using the switch statement - Part 1 Using the switch statement - Part 2 Replacing the if-else block with the switch statement ...
ECMAScript 3(1999 年 12 月):添加了许多核心功能-“[…]正则表达式,更好的字符串处理,新的控制语句[do-while,switch],try/catch 异常处理,[…]” ECMAScript 4(2008 年 7 月放弃):本来会是一次大规模升级(包括静态类型、模块、命名空间等),但最终变得过于雄心勃勃,分裂了语言的管理者。
Do-while loops There are also several more specialized loops, such as forEach. 23) What kind of conditional statements does JavaScript support? These are the conditional statements supported by JavaScript: If If-else If-else if-else Switch ...
be able to force a group of statements to repeat in a loop using the for, while, and do-while commands, using both dependent and independent conditions on the number of iterations; understand and be able to use loop-specific break and continue instructions; ...
do while The while loop loops through a block of code as long as a specified condition is true. while (condition) { code block to be executed } for The for loop is often the tool you will use when you want to create a loop. for (statement 1; statement 2; statement 3) { code ...
// Function to check if a number is a happy number function happy_number(num) { var m, n; var c = []; // Continue loop until the number becomes 1 or enters a cycle while (num !== 1 && c[num] !== true) { c[num] = true; m = 0; // Calculate the sum of the squares...
// Define a function named bubble_Sort that implements the bubble sort algorithm on an arrayfunctionbubble_Sort(a){// Initialize variables for swapping (swapp), the array length (n), and a copy of the array (x)varswapp;varn=a.length-1;varx=a;// Use a do-while loop to repeatedly ...