From 95aca4b4d8fa62815d4bd412fff1a364f842814a Mon Sep 17 00:00:00 2001 From: Ryan Johnson Date: Thu, 29 Apr 2021 16:16:42 -0700 Subject: remove retired locales (#699) --- .../global_objects/string/substring/index.html | 195 --------------------- 1 file changed, 195 deletions(-) delete mode 100644 files/vi/web/javascript/reference/global_objects/string/substring/index.html (limited to 'files/vi/web/javascript/reference/global_objects/string/substring') diff --git a/files/vi/web/javascript/reference/global_objects/string/substring/index.html b/files/vi/web/javascript/reference/global_objects/string/substring/index.html deleted file mode 100644 index e53b920581..0000000000 --- a/files/vi/web/javascript/reference/global_objects/string/substring/index.html +++ /dev/null @@ -1,195 +0,0 @@ ---- -title: String.prototype.substring() -slug: Web/JavaScript/Reference/Global_Objects/String/substring -translation_of: Web/JavaScript/Reference/Global_Objects/String/substring ---- -
{{JSRef}}
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substring() phương thức trả về chuỗi con của 1 chuỗi bắt đầu từ vị trí bắt đầu đến vị trí kết thúc, hoặc đến cuối chuỗi nếu không có vị trí kết thúc

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Cú pháp

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str.substring(indexStart[, indexEnd])
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Parameters

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indexStart
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Một số integer giữa 0 và một số nhỏ hơn độ dài chuỗi, xác định vị trí kí tự đầu tiên trong chuỗi gốc để đưa vào chuỗi con.
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indexEnd
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Không bắt buộc. Một số integer giữa 0 và độ dài chuỗi. Chuỗi con không bao gồm ký tự ở vị trí indexEnd.
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Return value

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Chuỗi con trả về là chuỗi nằm ở vị trí từ indexStart đến vị trí ( indexEnd - 1 )

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Description

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substring() lấy ký tự từ vị trí indexStart tới vị trí (nhưng không bao gồm) indexEnd. Đặc biệt:

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Nếu indexStart lớn hơn indexEnd, chúng se được đổi chỗ; ví dụ, str.substring(1, 0) == str.substring(0, 1).

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Examples

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Using substring()

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The following example uses substring() to display characters from the string 'Mozilla':

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var anyString = 'Mozilla';
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-// Displays 'Moz'
-console.log(anyString.substring(0, 3));
-console.log(anyString.substring(3, 0));
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-// Displays 'lla'
-console.log(anyString.substring(4, 7));
-console.log(anyString.substring(4));
-console.log(anyString.substring(7, 4));
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-// Displays 'Mozill'
-console.log(anyString.substring(0, 6));
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-// Displays 'Mozilla'
-console.log(anyString.substring(0, 7));
-console.log(anyString.substring(0, 10));
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Using substring() with length property

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The following example uses the substring() method and {{jsxref("String.length", "length")}} property to extract the last characters of a particular string. This method may be easier to remember, given that you don't need to know the starting and ending indices as you would in the above examples.

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// Displays 'illa' the last 4 characters
-var anyString = 'Mozilla';
-var anyString4 = anyString.substring(anyString.length - 4);
-console.log(anyString4);
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-// Displays 'zilla' the last 5 characters
-var anyString = 'Mozilla';
-var anyString5 = anyString.substring(anyString.length - 5);
-console.log(anyString5);
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Replacing a substring within a string

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The following example replaces a substring within a string. It will replace both individual characters and substrings. The function call at the end of the example changes the string 'Brave New World' into 'Brave New Web'.

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// Replaces oldS with newS in the string 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;
-}
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-replaceString('World', 'Web', 'Brave New World');
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Note that this can result in an infinite loop if oldS is itself a substring of newS — for example, if you attempted to replace 'World' with 'OtherWorld' here. A better method for replacing strings is as follows:

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function replaceString(oldS, newS, fullS) {
-  return fullS.split(oldS).join(newS);
-}
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The code above serves as an example for substring operations. If you need to replace substrings, most of the time you will want to use {{jsxref("String.prototype.replace()")}}.

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Specifications

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SpecificationStatusComment
{{SpecName('ES1')}}{{Spec2('ES1')}}Implemented in JavaScript 1.0.
{{SpecName('ES5.1', '#sec-15.5.4.15', 'String.prototype.substring')}}{{Spec2('ES5.1')}}
{{SpecName('ES6', '#sec-string.prototype.substring', 'String.prototype.substring')}}{{Spec2('ES6')}}
{{SpecName('ESDraft', '#sec-string.prototype.substring', 'String.prototype.substring')}}{{Spec2('ESDraft')}}
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Browser compatibility

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{{CompatibilityTable}}
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FeatureChromeFirefox (Gecko)Internet ExplorerOperaSafari
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
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FeatureAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
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See also

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