2.ParseFloat(string) 语法parseFloat(string) 参数 字符串:要解析的数值。如果数值不是字符串,将自动转换为字符串 let inputString ="100Something"; let number = parseFloat(inputString);// number will be 100 处理空白、字符和特殊情况 空白:忽略前导空格 字符继续解析,直到函数解析到一个无法转换成数字的字符。
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’...
Managing data is one of the fundamental concepts of programming. Converting a Number to a String is a common and simple operation. The same goes for the other...
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.
Many developers use+xto convert a string to a number. The JavaScript language spec states that+xis equivalent toNumber(x). +'42 fail';// NaN+({ valueOf: () =>'42'});// 42+({ toString: () =>'42'});// 42+(null);// 0+(' ');// 0 ...
toExponential()Returns a string, with a number rounded and written using exponential notation. toFixed()Returns a string, with a number rounded and written with a specified number of decimals. toPrecision()Returns a string, with a number written with a specified length ...
console.log(Number('246'))console.log(Number('246.5'))console.log(Number(undefined))console.log(Number('Hello')) Output: 246246.5NaNNaN Use theparseInt()Function to Convert a String to Integer in JavaScript Another way of dealing with string numbers is using theparseInt()method of JavaScript....
If you add a string and a number, the result will be a string concatenation: Example letx ="10"; lety =20; letz = x + y; Try it Yourself » A common mistake is to expect this result to be 30: Example letx =10; lety =20; ...
You can convert an integer to a string in JavaScript, in the following ways: Using the String Wrapper Object;
In this tutorial, we'll learn by example how to convert a string to the corresponding integer or float number or array of numbers using the built-in JavaScript methods with simple React and Vue.js examples