How to convert numeric value to string using toString in JavaScript

The toString method is "to String (string)", which is the method used when "converting to a string". In How to convert numeric value to string using toString in JavaScript, all values ​​are divided into data types such as numeric values, strings, and arrays. toString method is used when converting a non-string to a string.

How to use toString method?

How to get the number of digits in a number

If you want to get a big number, such as 100000000000000000000, you can get it if you use length Numerical, but length is a method used by strings and cannot be used by numbers.

var num = 10000000000000;
console.log(num.length);

The execution result is as follows:

undefiened

Therefore, the number of characters can be obtained by converting the numerical value to a string.

Let’s use toString()

var num = 10000000000000; 
var digits = num.toString().length; 
console.log(digits + "位数");

The execution result is:

14位数

In this way, we use the toString method to convert non-strings (such as numbers) into characters string.

When converting a numeric value to a string, you can also perform base conversion at the same time.

The code is as follows

var num = 10;
var bin_converted = num.toString(2);
var hex_converted = num.toString(16);
 
console.log("10的二进制是：" + bin_converted);
console.log("10的十六进制是：" + hex_converted);

The execution results are as follows:

10的二进制是：1010
10的十六进制是：a

In addition to numbers, dates (Date), arrays (Array), objects = associative arrays ( Object), etc. can also be converted to strings.

How to convert date to string?

You can also use the toString method to convert the date (Date object) into a string

var date = new Date(); // 今天的日期
console.log("今天：" + date.toString());
console.log("今天：" + date.toISOString());

The execution results are as follows:

今天：Sat Jan 19 2019 15:27:22 GMT+0800 (中国标准时间)
今天：2019-01-19T07:27:22.656Z

Note: The toISOString method is used to output in ISO standard format

How to convert an array (Array) to a string?

Array can also be converted to string and output.

var array = ["苹果","橙子","香蕉","葡萄","柚子"]
console.log("喜欢的水果是：" + array.toString());

The execution result is as follows:

喜欢的水果是：苹果,橙子,香蕉,葡萄,柚子

Note: Since it is a string output by the toString method, it can be added together with other strings.

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