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) --- .../reference/operators/function/index.html | 175 --------------------- 1 file changed, 175 deletions(-) delete mode 100644 files/vi/web/javascript/reference/operators/function/index.html (limited to 'files/vi/web/javascript/reference/operators/function') diff --git a/files/vi/web/javascript/reference/operators/function/index.html b/files/vi/web/javascript/reference/operators/function/index.html deleted file mode 100644 index 1e302774be..0000000000 --- a/files/vi/web/javascript/reference/operators/function/index.html +++ /dev/null @@ -1,175 +0,0 @@ ---- -title: function expression -slug: Web/JavaScript/Reference/Operators/function -translation_of: Web/JavaScript/Reference/Operators/function ---- -
{{jsSidebar("Operators")}}
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Từ khóa function (hàm) có thể dùng để định nghĩa chức năng bên trong một biểu thức.

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Cú pháp

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var myFunction = function [name]([param1[, param2[, ..., paramN]]]) {
-   statements
-};
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Tham số

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name
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Tên hàm. Có thể bỏ qua, trong trường hợp chức năng đó là vô danh. Nó mô tả chính xác nhiệm vụ mà hàm sẽ làm.
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paramN
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Tên các đối số truyền vào.
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statements
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Các câu lệnh xử lý các đối số paramN truyền vào.
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Mô tả

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Một biểu thức chức năng (function) is very similar to and has almost the same syntax as a function statement (see function statement for details). The main difference between a function expression and a function statement is the function name, which can be omitted in function expressions to create anonymous functions. A function expression can be used as a IIFE (Immediately Invoked Function Expression) which runs as soon as it is defined. See also the chapter about functions for more information.

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Function expression hoisting

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Function expressions in JavaScript are not hoisted, unlike {{jsxref("Statements/function", "function declarations", "#Function_declaration_hoisting")}}. You can't use function expressions before you define them:

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notHoisted(); // TypeError: notHoisted is not a function
-
-var notHoisted = function() {
-   console.log('bar');
-};
-
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Examples

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The following example defines an unnamed function and assigns it to x. The function returns the square of its argument:

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var x = function(y) {
-   return y * y;
-};
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Named function expression

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If you want to refer to the current function inside the function body, you need to create a named function expression. This name is then local only to the function body (scope). This also avoids using the non-standard arguments.callee property.

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var math = {
-  'factorial': function factorial(n) {
-    if (n <= 1)
-      return 1;
-    return n * factorial(n - 1);
-  }
-};
-
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Specifications

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SpecificationStatusComment
{{SpecName('ESDraft', '#sec-function-definitions', 'Function definitions')}}{{Spec2('ESDraft')}} 
{{SpecName('ES6', '#sec-function-definitions', 'Function definitions')}}{{Spec2('ES6')}} 
{{SpecName('ES5.1', '#sec-13', 'Function definition')}}{{Spec2('ES5.1')}} 
{{SpecName('ES3', '#sec-13', 'Function definition')}}{{Spec2('ES3')}}Initial definition. Implemented in JavaScript 1.5.
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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}}
Trailing comma in parameters{{CompatUnknown}}{{CompatGeckoDesktop("52.0")}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
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FeatureAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}{{CompatVersionUnknown}}
Trailing comma in parameters{{CompatUnknown}}{{CompatUnknown}}{{CompatGeckoMobile("52.0")}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}
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See also

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