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In this article, the editor introduces in detail "what are the data types of WeChat Mini Programs WXS language", with detailed content, clear steps and proper handling of details. I hope that this article "what are the data types of WeChat Mini Programs WXS language" can help you solve your doubts.

Data type

The WXS language currently has the following data types:

Number: numeric

String: string

Boolean: Boolean valu

Object: object

Function: function

Array: array

Date: date

Regexp: regular

Number syntax

Number includes two kinds of values: integer and decimal.

Var a = 10 setvar PI = 3.141592653589793; attribute

Constructor: returns the string "Number".

Method

ToString

ToLocaleString

ValueOf

ToFixed

ToExponential

ToPrecision

For the specific use of the above methods, please refer to the ES5 standard. String syntax

String can be written in two ways:

'hello world'; "hello world"; attribute

Constructor: returns the string "String".

Length

Please refer to the ES5 standard for the specific meaning of attributes other than constructor. Method

ToString

ValueOf

CharAt

CharCodeAt

Concat

IndexOf

LastIndexOf

LocaleCompare

Match

Replace

Search

Slice

Split

Substring

ToLowerCase

ToLocaleLowerCase

ToUpperCase

ToLocaleUpperCase

Trim

For the specific use of the above methods, please refer to the ES5 standard. Boolean syntax

Boolean values have only two specific values: true and false.

Attribute

Constructor: returns the string "Boolean".

Method

ToString

ValueOf

For the specific use of the above methods, please refer to the ES5 standard. Object syntax

Object is an unordered key-value pair. The usage is as follows:

Var o = {} / generate a new empty object / / generate a new non-empty object o = {'string': 1, / the key of / / object can be the string const_var: 2, the key of / / object can also be the identifier func: {}, the value of / / object can be any type}; / / the read operation of the object property console.log (1 = = o [' string']) Console.log (2 = o.const_var); / / write operation of object attribute o ['string'] + +; o [' string'] + = 10. Read operation of object attribute console.log (12 = = o ['string']); console.log (13 = o.const_var); attribute

Constructor: returns the string "Object".

Console.log ("Object" = = {k: "1", v: "2"} .constructor) method

ToString: returns the string "[object Object]".

Function syntax

Function supports the following definition methods:

/ / method 1function a (x) {return x;} / / method 2var b = function (x) {return x;}

Function also supports the following syntax (anonymous functions, closures, etc.):

Var a = function (x) {return function () {return x;}} var b = a (100); console.log = = b (); arguments

You can use the arguments keyword in function. This keyword currently supports only the following attributes:

Length: the number of arguments passed to the function.

[index]: each parameter passed to the function can be iterated through the index subscript.

Sample code:

Var a = function () {console.log (3 = arguments.length); console.log (100 = arguments [0]); console.log (200 = arguments [1]); console.log (300 = arguments [2]);}; a (100200300); attribute

Constructor: returns the string "Function".

Length: returns the number of formal parameters of the function.

Method

ToString: returns the string "[function Function]".

Sample code:

Var func = function (a function Function bjorc) {} console.log ("Function" = func.constructor); console.log (3 = func.length); console.log ("[function Function]" = func.toString ()); array syntax

Array supports the following definition methods:

Var a = []; / / generate a new empty array a = [1, "2", {}, function () {}]; / / generate a new non-empty array with array elements that can be attributes of any type

Constructor: returns the string "Array".

Length

Please refer to the ES5 standard for the specific meaning of attributes other than constructor. Method

ToString

Concat

Join

Pop

Push

Reverse

Shift

Slice

Sort

Splice

Unshift

IndexOf

LastIndexOf

Every

Some

ForEach

Map

Filter

Reduce

ReduceRight

For the specific use of the above methods, please refer to the ES5 standard. Date syntax

To generate a date object, you need to use the getDate function, which returns an object at the current time.

GetDate () getDate (milliseconds) getDate (datestring) getDate (year, month [, date [, hours [, minutes [, seconds [, milliseconds])

Parameter milliseconds: number of milliseconds calculated from 00:00:00 UTC on January 1, 1970 datestring: date string in the format "month day, year hours:minutes:seconds"

Sample code:

Var date = getDate (); / / returns the current time object date = getDate (1500000000000); / / Fri Jul 14 2017 10:40:00 GMT+0800 (China Standard time) date = getDate ('2017-7-14'); / / Fri Jul 14 2017 00:00:00 GMT+0800 (China Standard time) date = getDate (2017, 6, 14, 10, 40, 0, 0); / Fri Jul 14 10:40:00 GMT+0800 (China Standard time) attribute

Constructor: returns the string "Date".

Method

Parse

UTC

Now

ToString

ToDateString

ToTimeString

ToLocaleString

ToLocaleDateString

ToLocaleTimeString

ValueOf

GetTime

GetFullYear

GetUTCFullYear

GetMonth

GetUTCMonth

GetDate

GetUTCDate

GetDay

GetUTCDay

GetHours

GetUTCHours

GetMinutes

GetUTCMinutes

GetSeconds

GetUTCSeconds

GetMilliseconds

GetUTCMilliseconds

GetTimezoneOffset

SetTime

SetMilliseconds

SetUTCMilliseconds

SetSeconds

SetUTCSeconds

SetMinutes

SetUTCMinutes

SetHours

SetUTCHours

SetDate

SetUTCDate

SetMonth

SetUTCMonth

SetFullYear

SetUTCFullYear

ToUTCString

ToISOString

ToJSON

For the specific use of the above methods, please refer to the ES5 standard. Regexp syntax

The getRegExp function is required to generate the regexp object.

GetRegExp (pattern [, flags])

Parameter: pattern: the contents of the regular expression. Flags: modifier. This field can only contain the following characters: G: globali: ignoreCasem: multiline.

Sample code:

Var a = getRegExp ("x", "img"); console.log ("x" = a.source); console.log (true = a.global); console.log (true = a.ignoreCase); console.log (true = a.multiline); attribute

Constructor: returns the string "RegExp".

Source

Global

IgnoreCase

Multiline

LastIndex

Please refer to the ES5 standard for the specific meaning of attributes other than constructor. Method

Exec

Test

ToString

For the specific use of the above methods, please refer to the ES5 standard. Data type judgment constructor attribute

The constructor attribute can be used to determine the data type.

Sample code:

Var number = 10 true;console.log console.log ("Number" = number.constructor); var string = "str"; console.log ("String" = string.constructor); var boolean = true;console.log ("Boolean" = boolean.constructor); var object = {}; console.log ("Object" = = object.constructor); var func = function () {}; console.log ("Function" = func.constructor); var array = []; console.log ("Array" = array.constructor); var date = getDate () Console.log ("Date" = date.constructor); var regexp = getRegExp (); console.log ("RegExp" = regexp.constructor); typeof

Using typeof, you can also distinguish some data types.

Sample code:

Var number = 10 getRegExp boolean = true;var object = {}; var func = function () {}; var array = []; var date = getDate (); var regexp = getRegExp (); console.log ('number' = typeof number); console.log (' boolean' = typeof boolean); console.log ('object' = typeof object); console.log (' function' = typeof func); console.log ('object' = = typeof array); console.log (' object' = typeof date) Console.log ('object' = typeof regexp); console.log (' undefined' = typeof undefined); console.log ('object' = typeof null); read here, this article "what are the data types of WeChat Mini Programs WXS language" has been introduced. If you want to master the knowledge points of this article, you still need to practice and use it yourself to understand it. If you want to know more about related articles, please follow the industry information channel.

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