The FXS language currently has the following data types:

• 'number': Numeric value
• 'string': String
• 'boolean': Boolean value
• 'object': Object
• 'function': Function
• 'array': Array
• 'date': Date
• 'regexp': regular

number

syntax

Number includes two numeric values: integer, decimal.

var a = 10;
var PI = 3.141592653589793;

property

• 'constructor': Returns the string ''Number''.

method

• toString
• toLocaleString
• valueOf
• toFixed
• toExponential
• toPrecision

Please refer to the 'ES5' standard for the specific use of the above methods

string

syntax

String can be written in two ways:

'hello world';
"hello world";

property

• 'constructor': Returns the string ''String''.
• length

For the specific meanings of attributes other than 'constructor', please refer to the 'ES5' standard

method

• toString
• valueOf
• charAt
• charCodeAt
• concat
• indexOf
• lastIndexOf
• localeCompare
• match
• replace
• search
• slice
• split
• substring
• toLowerCase
• toLocaleLowerCase
• toUpperCase
• toLocaleUpperCase
• trim

Please refer to the 'ES5' standard for the specific use of the above methods

boolean

syntax

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

property

• 'constructor': Returns the string ''Boolean''.

method

• toString
• valueOf

Please refer to the 'ES5' standard for the specific use of the above methods

object

syntax

Object is an unordered key-value pair. Here's how to use it:

var o = {} // generates a new empty object

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

Read operations for object properties
console.log(1 === o['string']);
console.log(2 === o.const_var);

Write operations for object properties
o['string']++;
o['string'] += 10;
o.const_var++;
o.const_var += 10;

Read operations for object properties
console.log(12 === o['string']);
console.log(13 === o.const_var);

property

• '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 definitions:

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

The 'arguments' keyword can be used in function. The keyword currently only supports the following attributes:

• 'length': the number of arguments passed to the function.
• '[index]': The 'index' subscript allows you to iterate over every argument passed to the function.

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);

property

• '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,b,c) { }

console.log("Function" === func.constructor);
console.log(3 === func.length);
console.log("[function Function]" === func.toString());

array

syntax

Array supports the following definitions:

var a = [];      Generates a new empty array

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

property

• 'constructor': Returns the string ''Array''.
• length

For the specific meanings of attributes other than constructor, see 'ES5' standard.

method

• toString
• concat
• join
• pop
• push
• reverse
• shift
• slice
• sort
• splice
• unshift
• indexOf
• lastIndexOf
• every
• some
• forEach
• map
• filter
• reduce
• reduceRight

Please refer to the 'ES5' standard for the specific use of the above methods.

date

syntax

Generating a date object requires the use of the 'getDate' function, which returns an object of the current time.

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

parameters

• 'milliseconds': The 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 2017 10:40:00 GMT+0800 (China Standard Time)

property

• 'constructor': Returns the string ''Date''.

method

• 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

Please refer to the 'ES5' standard for the specific use of the above methods

regexp

syntax

Generating a regexp object requires the use of the 'getRegExp' function.

getRegExp(pattern[, flags])

• Parameters:
  • 'pattern': The content of the regular expression.
  • 'flags': modifier. The field can contain only 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);

property

• 'constructor': Returns the string ''RegExp''.
• source
• global
• ignoreCase
• multiline
• lastIndex

For the specific meanings of attributes other than constructor, see 'ES5' standard.

method

• exec
• test
• toString

Please refer to the 'ES5' standard for the specific use of the above methods.

Data type judgment

constructor attribute

The 'constructor' attribute can be used for data type judgments.

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

Using 'typeof' also allows you to distinguish between some 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 );