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CSSStyleDeclaration JS Conversion


JavaScript Dizisi substr()

Örnekler

Metinden bir alt dize ayıklayın:

let text = "Hello world!";
let result = text.substr(1, 4);"

2. pozisyondan başlayın:

let result = text.substr(2);

Aşağıda daha fazla örnek.


Tanım ve Kullanım

Yöntem substr(), bir dizenin bir bölümünü çıkarır.

Yöntem substr(), belirtilen bir konumda başlar ve belirtilen sayıda karakter döndürür.

Yöntem substr(), orijinal dizeyi değiştirmez.

Dizenin sonundan karakterleri çıkarmak için negatif bir başlangıç ​​konumu kullanın.


Sözdizimi

string.substr(start, length)

parametreler

Parameter Description
start Required.
The start position.
First character is at index 0.

If start is greater than the length, substr() returns "".
If start is negative, substr() counts from the end of the string.
length Optional.
The number of characters to extract.
If omitted, it extracts the rest of the string

Geri dönüş değeri

Tip Açıklama
DiziÇıkarılan parçayı içeren bir dize. Uzunluk
0 veya negatifse boş bir dize döndürülür.


Daha fazla örnek

Sadece ilk:

let result = text.substr(0, 1);

Sadece son:

let result = text.substr(text.length-1, 1);

son 6:

let result = text.substr(-5, 5);

Tarayıcı Desteği

substr()bir ECMAScript1 (ES1) özelliğidir.

ES1 (JavaScript 1997) tüm tarayıcılarda tam olarak desteklenir:

Chrome IE Edge Firefox Safari Opera
Yes Yes Yes Yes Yes Yes