A free form text string. 更多...
The
string
type refers to a free form text string in quotes, for example "Hello world!". The QML language provides this value type by default.
范例：
Text { text: "Hello world!" }
Properties of type
string
are empty by default.
Strings have a
length
attribute that holds the number of characters in the string.
The string value type is backed by the C++ type
QString
. It extends the JavaScript String primitive type in that it provides much of the same API, plus some extra methods. For example, the QML string value type method
arg()
supports value substitution:
var message = "There are %1 items" var count = 20 console.log(message.arg(count))
The example above prints "There are 20 items".
The QML string value type supports most of the ECMAScript string features, such as template (string) literals, string interpolation, multi-line strings, and looping over strings.
In general, QML string supports most JavaScript String methods, including checking for inclusion using
string.includes()
,
string.startsWith()
，和
string.endsWith()
; repeating a string using
string.repeats()
, and slicing and splitting using
string.slice()
and
string.split()
.
For more information about which version of ECMAScript QML supports, see JavaScript 主机环境
For more information about JavaScript String methods, see mdn JavaScript String
When integrating with C++, note that any
QString
值
passed into QML from C++
is automatically converted into a
string
value, and vice-versa.
另请参阅 QML Value Types and ECMAScript 语言规范 .
