Does javascript have data types?

JavaScript has data types, which are: 1. Primitive data types, object, number, string, boolean, null and undefined; 2. Reference data types, Array, Date and function of object type.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

Javascript's data types are divided into two categories: original data types and reference data types

Original data type:

Object

## Number

String

# Boolean

NULL

## Undefined

## 引 The data type:

Object type Array, Date, Function

js variables

[1] Declaration of variables in js

v variable name = value;

## [2] The use of variables in js pay attention to pay attention to The names of the variables in

# A, JS are consistent with the naming of Java's bidders.

B, JS variable names can be repeated, but the name of the latter will cover the name of the former

# C and JS. It is not recommended that you write this way.

Commonly used type detection methods are: typeof, instanceof

Liezi:

var age = 13；
alert(typeof(age));    //浏览器弹框内容：number
var name = '五宝';
alert(typeof(age));    //浏览器弹框内容：string    注意，JavaScript没有char类型

nbsp;html>

    
        <meta>
        <title></title>
        <script>
            var  a =1;
            var  b =null;
            var  c ="你好";
            var  d=true;
            var  e=new  Date();
            var  f=&#39;5&#39;;
            var  z=1.32;
            var  a=123;
            alert(typeof(e));    //浏览器弹框出现  object
        </script>
    
    
    

[Recommended learning:

javascript advanced tutorial]

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