Number QML Type

The Number object provides represents a number value. 更多...

import 语句： import QtQml

所有成员列表，包括继承成员

方法

string fromLocaleString ( locale , number )
string toLocaleCurrencyString ( locale , symbol )
string toLocaleString ( locale , format , precision )

详细描述

The QML Number object extends the JS Number object with locale aware functions.

另请参阅 Locale .

方法文档编制

string fromLocaleString ( locale , number )

Returns a Number by parsing number using the conventions of the supplied locale .

若 locale is not supplied the default locale will be used.

For example, using the German locale:

var german = Qt.locale("de_DE");
var d;
d = Number.fromLocaleString(german, "1234,56")   // d == 1234.56
d = Number.fromLocaleString(german, "1.234,56") // d == 1234.56
d = Number.fromLocaleString(german, "1234.56")  // throws exception
d = Number.fromLocaleString(german, "1.234")    // d == 1234.0

另请参阅 Locale .

string toLocaleCurrencyString ( locale , symbol )

Converts the Number to a currency using the currency and conventions of the specified locale 。若 symbol is specified it will be used as the currency symbol.

另请参阅 Locale::currencySymbol ().

string toLocaleString ( locale , format , precision )

Converts the Number to a string suitable for the specified locale 以指定 format , with the specified precision .

Valid formats are:

'f' Decimal floating point, e.g. 248.65
'e' Scientific notation using e character, e.g. 2.4865e+2
'E' Scientific notation using E character, e.g. 2.4865E+2
'g' Use the shorter of e or f
'G' Use the shorter of E or f

If precision is not specified, the precision will be 2.

If the format is not specified 'f' will be used.

若 locale is not specified, the default locale will be used.

The following example shows a number formatted for the German locale:

import QtQuick 2.0
Text {
    text: "The value is: " +  Number(4742378.423).toLocaleString(Qt.locale("de_DE"))
}

You can customize individual fields of the locale to tightly control the output:

let locale = Qt.locale("de_DE");
let a = Number(1000).toLocaleString(locale)); // a == 1.000,00
locale.numberOptions = Locale.OmitGroupSeparator;
let b = Number(1000).toLocaleString(locale)); // b == 1000,00

You can apply toLocaleString() directly to constants, provided the decimal is included in the constant, e.g.

123.0.toLocaleString(Qt.locale("de_DE")) // OK
123..toLocaleString(Qt.locale("de_DE"))  // OK
123.toLocaleString(Qt.locale("de_DE"))   // fails

另请参阅 Locale .