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DocumentationTencent Cloud Super App as a ServiceGuildlines for Mini Program DevelopmentFrameworkWXS Syntax ReferenceData Types
Data Types
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Last updated: 2025-03-17 17:23:30
Data Types
Last updated: 2025-03-17 17:23:30
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The WXS language currently supports the following data types:
number;
string;
boolean;
object;
function;
array;
date;
regexp;

number

Syntax

There are two types of numbers: integers and decimals.
var a = 10;
var PI = 3.141592653589793;

Properties

constructor: Returns the string "Number"

Methods

toString；
toLocaleString；
valueOf；
toFixed；
toExponential；
toPrecision。
For information on using the above methods, refer to the ES5 standard.

string

Syntax

here are two ways to write a string:
'hello world';
"hello world";

Properties

constructor：Returns the string "String";
length。
For explanations of properties other than constructor, refer to the ES5 standard.

Methods

toString；
valueOf；
charAt；
charCodeAt；
concat；
indexOf；
lastIndexOf；
localeCompare；
match；
replace；
search；
slice；
split；
substring；
toLowerCase；
toLocaleLowerCase；
toUpperCase；
toLocaleUpperCase；
trim。
For information on using the above methods, refer to the ES5 standard.

boolean

Syntax

Boolean values can take one of two values: true or false.

Properties

constructor：Returns the string "Boolean".

Methods

toString；
valueOf。
For information on using the above methods, refer to the ES5 standard.

object

Syntax

An object is a type of unordered key-value pair, which can be used in the following ways:
var o = {} // Generates a new empty object.

// Generates a new non-empty object.
o = {
  'string'  : 1,  //The object’s key can be a string.
  const_var : 2,  //The object’s key can also be an identifier that conforms to the variable definition rules.
  func      : {}, //The object’s value can be of any type.
};

//Object property read operation
console.log(1 === o['string']);
console.log(2 === o.const_var);

//Object property write operation
o['string']++;
o['string'] += 10;
o.const_var++;
o.const_var += 10;

//Object property read operation
console.log(12 === o['string']);
console.log(13 === o.const_var);

Properties

constructor: Returns the string "Object".
console.log("Object" === {k:"1",v:"2"}.constructor)

Methods

toString: Returns the string "[object Object]".

function

Syntax

function supports the following definition methods:
//Method 1
function a (x) {
  return x;
}

//Method 2
var 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( 100 === b() );

arguments

In function, you can use the arguments keyword. This keyword only has the following properties at present:
length: The number of arguments passed to the function.
[index]: Each argument passed to the function can be traversed by 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(100,200,300);

Properties

constructor: Returns the string "Function".
length: Returns the number of formal parameters of the function

Methods

toString: Returns the string "[function Function]".
Sample code:
var func = function (a,b,c) { }

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 = [];      // Generates a new empty array.

a = [1,"2",{},function(){}];  // Generates a new non-empty array, with array elements of any type.

Properties

constructor: Returns the string "Array";
length。
For explanations of properties other than constructor, refer to the ES5 standard.

Methods

toString；
concat；
join；
pop；
push；
reverse；
shift；
slice；
sort；
splice；
unshift；
indexOf；
lastIndexOf；
every；
some；
forEach；
map；
filter；
reduce；
reduceRight。
For information on using the above methods, refer to the ES5 standard.

date

Syntax

Generates the getDate function required by the date object and returns a current time object.
getDate()
getDate(milliseconds)
getDate(datestring)
getDate(year, month[, date[, hours[, minutes[, seconds[, milliseconds]]]]])
Parameters
milliseconds: The number of milliseconds from 00:00:00 UTC January 1, 1970.
datestring: The 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 2017 10:40:00 GMT+0800 (China Standard Time)

Properties

constructor: Returns the string "Date".

Methods

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 information on using the above methods, refer to the ES5 standard.

regexp

Syntax

Generates the getRegExp function to be used by the regexp object.
getRegExp(pattern[, flags])
Parameters:
pattern: The content of the regular expression.
flags: The modifiers. This field can only include the following characters:
g: global
i: ignoreCase
m: 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);

Properties

constructor：Returns the string "RegExp"；
source；
global；
ignoreCase；
multiline；
lastIndex。
For explanations of properties other than constructor, refer to the ES5 standard.

Methods

exec；
test；
toString。
For information on using the above methods, refer to the ES5 standard.


Data Type Determination

constructor Property

You can use the constructor property to determine the data type.
Sample code:
var number = 10;
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

You can also use typeof to distinguish certain data types. Sample code:
var number = 10;
var 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 );

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