var i=0 do { document.write("The number is " + i) document.write("") i=i+1 } while (i<0) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 结果为: The number is 0 1. 3.switch语句 switch 语句是 if 语句的兄弟语句。 开发者可以用 switch 语句为表达式提供一...
isNum(a)调用了,上面两个判断的函数,都不满足,则退出。 若其中一个满足,则一直循环。 var a = new Array(); for (var i = 0; i < 3; i++) { a[i] = prompt("请输入三角形第" + (i + 1) + "条边的边长"); a[i] = Number(isNum(a[i])); } 1. 2. 3. 4. 5. 我们获取到...
Before we wrap up, let’s put your knowledge of Javascript Program to Check if a Number is Odd or Even to the test! Can you solve the following challenge? Challenge: Write a function to check if a number is odd or even. If the number is even, return "Even"; otherwise, return "...
Shortest code to check if a number is in a range in, Shortest code to check if a number is in a range in JavaScript. This is how I checkout to see if a number is in a range (in between two other numbers): var a = 10, b = 30, x = 15, y = 35; x < Math.max (a,b)...
}functionisPrimeNumber(num){varhalfNum = num/2; halfNum =parseInt(halfNum);// check if number is divisible by 2,// if yes then its not a prime number.if(num%2===0){returnfalse; }do{// if number is divisible by its half value,// if yes, than its not prime numberif(num%half...
JavaScript Code: // Define a function 'isEven' that checks if a number 'num' is evenconstisEven=num=>num%2===0;// Test cases to check if numbers are evenconsole.log(isEven(3));// false (3 is not even)console.log(isEven(32));// true (32 is even)console.log(isEven(1));//...
简介:JavaScript基础语法:包括变量声明、数据类型(Number, String, Boolean, Null, Undefined, Symbol, Object)、运算符、流程控制语句(if...else, switch, for, while, do...while)等。 JavaScript基础语法涵盖了多个重要概念,以下是一些简要的介绍:
JavaScript的对象可以直接创建，将函数封装进去，这样一来就可以减少if-else语句进行多层嵌套了，代码显得...
Determining the sign of a number is super easy now with ES6's Math.sign! It will indicate whether the number is positive, negative or zero...
if (a 是一个合法数字 || !a用来判断变量未定义、空字符串、数字0和NaN、空对象)!a : 将a转换为一个 boolean 的简写方式，各类型转换成boolean值规范如下：数据类型 true false Number 任何非0数字值 0和NaN String 非空字符串 ''(空字符串)Object 任何对象 null Und...