Converting a JavaScript string into a number is useful for comparing numerical data that comes in string format and completing math operations. Here are seven methods to do it.
// Number to StringletnumToStr =newString(2);// String {'2'}// String to NumberletstrToNum =newNumber('2');// Number {2} This practice is, however,discouraged. When using primitive data the object methods should not be used to create them. ...
A stringThe number as a string. More Examples Convert a number to a string, using base 8 (Octal): letnum =15; lettext = num.toString(8); Try it Yourself » Convert a number to a string, using base 16 (Hexadecimal): letnum =15; ...
One “trick” is to use the unary operator + before the string:+'10,000' //NaN ✅ +'10.000' //10 ✅ +'10.00' //10 ✅ +'10.20' //10.2 ✅ +'10.81' //10.81 ✅ +'10000' //10000 ✅ See how it returns NaN in the first example, which is the correct behavior: it’...
There are several methods of converting a string into a number: parseInt() #; parseFloat() #, Number() #, etc. See examples.
方法Methods 所有原生的数值相关函数均被保存在对象原型( Number.prototype )里,可以直接调用。 Number.prototype.toFixed(fractionDigits?) > 0.0000003.toFixed(10) '0.0000003000' Number.prototype.toPrecision(precision?) > 1234..toPrecision(3) '1.23e+3' ...
JavaScript Number() ❮PreviousJavaScriptGlobal MethodsNext❯ Examples Convert booleans and dates to a number: Number(true); Number(false); Number(newDate()); Try it Yourself » More examples below. Description TheNumber()method converts a value to a number....
TheNumber()method converts a string to a number. Sometimes it’s an integer. Other times it’s a point number. And if you pass in a string with random text in it, you’ll getNaN, an acronym for “Not a Number.” As a result of this inconsistency, it’s a less safe choice than...
Mathis a built-in object in JavaScript which has methods for complex mathematical operations. It works on the data type number. But few methods of this in-built object are used to convert the string to an integer. For example, console.log(Math.ceil('123'));console.log(Math.floor('300'...
英文| https://javascript.plainenglish.io/summary-of-commonly-used-methods-for-js-arrays-collect-it-quickly-76c382929a20 翻译| 杨小爱 数组,是JavaScript中的一种数据格式,在JavaScript中经常使用。作为一名前端工程师,掌握Array的用法非常重要! 那么,...