Shulou(Shulou.com)06/01 Report--

This article mainly explains "javascript how to force the value type into a string", the content of the article is simple and clear, easy to learn and understand, now please follow the editor's train of thought slowly in depth, together to study and learn "javascript how to force the value type into a string" bar!

Forced conversion method: 1, call toString () method, syntax "data object to be converted .toString ()"; 2, call String () function, syntax "String (data to be converted)"; 3, use "+" character to concatenate strings, syntax "data to be converted +".

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Cast refers to casting one data type to another. Generally refers to the conversion of other data types to String, Number, Boolean.

Let's talk about how to force a value type to the string String.

Convert to String type

There are three ways to convert other numeric values to strings: toString (), String (), and spelling.

Method 1: call the toString () method of the converted data type

This method does not affect the original variable, it returns the result of the conversion, but note: the values null and undefined do not have a toString () method, and an error will be reported if their method is called.

Var a = 123 a = a.toString (); console.log (a); console.log (typeof a)

Method 2: call the String () function and pass the converted data to the function as parameters

When you use the String () function to cast, the toString () method is actually called for Number and Boolean, but for null and undefined, the toString () method is not called, it converts null directly to "null" and undefined directly to "undefined".

Var a = 123 console.log a = String (a); console.log (a); console.log (typeof a); var b = undefined;b = String (b); console.log (b); console.log (typeof b); var c = null;c = String (c); console.log (c); console.log (typeof c)

Method 3: for any data type + ""

Var a = 123 a = a + "; console.log (a); console.log (typeof a); Thank you for reading, this is the content of" javascript how to force the value type to a string ". After the study of this article, I believe you have a deeper understanding of how to force the value type to a string, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.