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

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100db36a723c770d327fc0aef2ce13b1
    93f0f5c25f18dab9d176bd4f6de5d30e
        4d0d87937f6c83b675e896c64d3eb7c9
        b2386ffb911b14667cb8f0f91ea547a76e916e0f7d1e588d4f442bf645aedb2f
        3f1c4e4b6b16bbbd69b2ee476dc4f83a
            var  a =1;
            var  b =null;
            var  c ="你好";
            var  d=true;
            var  e=new  Date();
            var  f='5';
            var  z=1.32;
            var  a=123;
            alert(typeof(e));    //浏览器弹框出现  object
        2cacc6d41bbb37262a98f745aa00fbf0
    9c3bca370b5104690d9ef395f2c5f8d1
    6c04bd5ca3fcae76e30b72ad730ca86d
    36cc49f0c466276486e50c850b7e4956
73a6ac4ed44ffec12cee46588e518a5e

[Recommended learning:

javascript advanced tutorial]

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