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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..
substring() ( ), , , .
str.substring(indexA[, indexB])
substring() , indexA , , indexB. :
indexA indexB, substring() .indexB , substring() .NaN, 0.stringName.length, stringName.length. indexA indexB, substring() , ; , str.substring(1, 0) == str.substring(0, 1).
substring() substring() 'Mozilla':
var anyString = "Mozilla";
// 'Moz'
console.log(anyString.substring(0, 3));
console.log(anyString.substring(3, 0));
// 'lla'
console.log(anyString.substring(4, 7));
console.log(anyString.substring(7, 4));
// 'Mozill'
console.log(anyString.substring(0, 6));
// 'Mozilla'
console.log(anyString.substring(0, 7));
console.log(anyString.substring(0, 10));
substring() length substring() length . , , , .
// 'illa' - 4
var anyString = "Mozilla";
var anyString4 = anyString.substring(anyString.length - 4);
console.log(anyString4);
// 'zilla' - 5
var anyString = "Mozilla";
var anyString5 = anyString.substring(anyString.length - 5);
console.log(anyString5);
. , . ' ' ' '.
// oldS newS fullS
function replaceString(oldS, newS, fullS) {
for (var i = 0; i < fullS.length; ++i) {
if (fullS.substring(i, i + oldS.length) == oldS) {
fullS =
fullS.substring(0, i) +
newS +
fullS.substring(i + oldS.length, fullS.length);
}
}
return fullS;
}
replaceString("", "", " ");
, , oldS newS , . :
function replaceString(oldS, newS, fullS) {
return fullS.split(oldS).join(newS);
}
. , String.prototype.replace().
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-string.prototype.substring |
This page was last modified on 29 . 2026 . by MDN contributors.
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