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55 lines
2.2 KiB
55 lines
2.2 KiB
9 years ago
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This JavaScript editing mode supports:
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- strict recognition of the Ecma-262 language standard
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- support for most Rhino and SpiderMonkey extensions from 1.5 and up
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- parsing support for ECMAScript for XML (E4X, ECMA-357)
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- accurate syntax highlighting using a recursive-descent parser
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- on-the-fly reporting of syntax errors and strict-mode warnings
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- undeclared-variable warnings using a configurable externs framework
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- "bouncing" line indentation to choose among alternate indentation points
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- smart line-wrapping within comments and strings
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- code folding:
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- show some or all function bodies as {...}
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- show some or all block comments as /*...*/
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- context-sensitive menu bar and popup menus
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- code browsing using the `imenu' package
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- many customization options
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Installation:
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To install it as your major mode for JavaScript editing:
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(add-to-list 'auto-mode-alist '("\\.js\\'" . js2-mode))
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Alternatively, to install it as a minor mode just for JavaScript linting,
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you must add it to the appropriate major-mode hook. Normally this would be:
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(add-hook 'js-mode-hook 'js2-minor-mode)
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You may also want to hook it in for shell scripts running via node.js:
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(add-to-list 'interpreter-mode-alist '("node" . js2-mode))
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To customize how it works:
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M-x customize-group RET js2-mode RET
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Notes:
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This mode includes a port of Mozilla Rhino's scanner, parser and
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symbol table. Ideally it should stay in sync with Rhino, keeping
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`js2-mode' current as the EcmaScript language standard evolves.
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Unlike cc-engine based language modes, js2-mode's line-indentation is not
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customizable. It is a surprising amount of work to support customizable
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indentation. The current compromise is that the tab key lets you cycle among
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various likely indentation points, similar to the behavior of python-mode.
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This mode does not yet work with "multi-mode" modes such as `mmm-mode'
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and `mumamo', although it could be made to do so with some effort.
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This means that `js2-mode' is currently only useful for editing JavaScript
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files, and not for editing JavaScript within <script> tags or templates.
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The project page on GitHub is used for development and issue tracking.
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The original homepage at Google Code has outdated information and is mostly
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unmaintained.
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