How to convert value to int type in javascript

In JavaScript, you can use the parseInt() method to convert the value to the int type. This method can convert the value to an integer. The syntax format is "parseInt(string,radix)". This method will first parse the character at position 0, and if it is not a valid number, it will directly return NaN.

The operating environment of this tutorial: Windows 10 system, JavaScript version 1.8.5, Dell G3 computer.

javascript converts the value to the int type

In javascript, you can use the parseInt() method to convert the value to the int type. The syntax is as follows:

parseInt(string, radix)

##ParametersDescriptionstringRequired. The string to be parsed. radixOptional. Represents the base of the number to be parsed. The value is between 2 ~ 36. # The parseInt() function parses a string and returns an integer.

The conversion process is as follows:

• #First parse the character at position 0. If it is not a valid number, NaN will be returned directly.

• If the character at position 0 is a number or can be converted to a valid number, continue to parse the character at position 1. If it is not a valid number, return the valid character at position 0 directly. number.

• And so on, analyzing each character one by one from left to right until a non-numeric character is found.

• parseInt() will convert all previously analyzed legal numeric characters into numerical values ​​and return them.

console.log(parseInt("123abc"));  //返回数字123
console.log(parseInt("1.73"));   //返回数字1
console.log(parseInt(".123"));   //返回值NaN

Dots in floating point numbers are illegal characters for parseInt(), so the decimal part of the value will not be converted.

If it is a numeric string starting with 0, parseInt() will treat it as an octal number: first convert it to an octal value, and then convert it to a decimal number and return it.

If it is a numeric string starting with 0x, parseInt() will treat it as a hexadecimal number: first convert it to a hexadecimal value, and then convert it to a decimal number and return .

var d = 010;  //八进制数字字符串
var e = 0x10;  //十六进制数字字符串
console.log(parseInt(d));  //返回十进制数字8
console.log(parseInt(e));  //返回十进制数字16

parseInt() also supports base mode, which can convert digital strings in different bases such as binary, octal, and hexadecimal into integers. The base mode is specified by the second parameter of the parseInt() function.

Example:

//把十六进制数字字符串“123abc”转换为十进制整数
var a = "123abc";  
console.log(parseInt(a,16));  //返回十进制整数1194684

//把二进制、八进制和十进制数字字符串转换为十进制的整数
console.log(parseInt("10",2));  //把二进制数字 10 转换为十进制整数，为 2
console.log(parseInt("10",8));  //把八进制数字 10 转换为十进制整数，为 8
console.log(parseInt("10",10));  //把十进制数字 10 转换为十进制整数，为 10

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