function isPositiveInteger(n) { return 0 === n % (!isNaN(parseFloat(n)) && 0 <= ~~n); } 描述:!isNaN(parseFloat(n)) 用于过滤 纯 字符串值, "" " " "string" 0 <= ~~n 过滤负数和大的非整数值,例如 "-40.1" , "129000098131766699" ; (!isNaN(parseFloat(n)) && 0 <= ~~n)...
Write a JavaScript function that checks if a positive integer can be expressed as the sum of two or more consecutive positive integers. Write a JavaScript function that finds one possible sequence of consecutive integers whose sum equals a given number. Write a JavaScript function that returns all...
The above function takes a positive integer num as input and loops through all numbers from 1 to num/2 to check if they are divisors of the input number. If a number is a divisor, it is added to an array of factors. Lastly, the function returns an array of factors which includes the...
integer() } } }); 3. 类型系统高级特性 条件类型(TypeScript) 代码语言:javascript 代码运行次数:0 运行 AI代码解释 type IsNumber<T> = T extends number ? true : false; type A = IsNumber<5>; // true type B = IsNumber<'5'>; // false 类型编程 代码语言:javascript 代码运行次数:0 运行 ...
if(number>0){// Positive}else{// Negative} versus if(Math.sign(number)>0){// Positive}else{// Negative} Indeed, if you're just checking the boolean status, then I'd just use the comparative operator instead of usingMath.sign. But whereMath.signshines is it returns a number value. ...
functioncheckInteger(x, y) {if(Number.isInteger(y / x)) {return"整数"; }return"非整数"; }console.log(checkInteger(5,10));// "整数"console.log(checkInteger(5,11));// "非整数" Number.isSafeInteger 判断传入的参数值是否是一个“安全整数”(safe integer) ...
A prime number is a positive integer that is only divisible by 1 and itself. For example, 2, 3, 5, 7, 11 are the first few prime numbers. Example: Check Prime Number // program to check if a number is prime or not // take input from the user const number = parseInt(prompt("...
返回:如果通过验证返回true;否则返回false*/functionisPositiveInteger(str) {varregexp = "^[0-9]+$";varregObj =newRegExp(regexp);if(str.search(regObj) != -1) {returntrue; }else{returnfalse; } } 8. 检查输入字符串是否是带小数的数字格式,可以是负数 ...
function pow(x, n) { let result = x; for (let i = 1; i < n; i++) { result *= x; } return result; } let x = prompt("x?", ''); let n = prompt("n?", ''); if (n < 1) { alert(`Power ${n} is not supported, use a positive integer`); } else { alert( po...
function checkInteger(x, y) { if (Number.isInteger(y / x)) { return "整数"; } return "非整数"; } console.log(checkInteger(5, 10)); // "整数" console.log(checkInteger(5, 11)); // "非整数" Number.isSafeInteger 判断传入的参数值是否是一个“安全整数”(safe integer) ...