зеркало из https://github.com/mozilla/gecko-dev.git
129 строки
4.4 KiB
HTML
129 строки
4.4 KiB
HTML
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<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta name="Author" content="Norris Boyd">
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<meta name="GENERATOR" content="Mozilla/4.7 [en]C-NSCP (WinNT; U) [Netscape]">
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<title>JavaScript Shell</title>
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</head>
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<body bgcolor="#FFFFFF">
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<center>
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<h1>
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JavaScript Shell</h1></center>
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The JavaScript shell provides a simple way to run scripts in batch mode
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or an interactive environment for exploratory programming.
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<h2>
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Invoking the Shell</h2>
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<tt>java org.mozilla.javascript.tools.shell.Main</tt> [<i>options</i>]
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<i>file</i><tt>.js
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[<i>script-arguments</i>]</tt>
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<p>where <i>options</i> are:
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<p><tt>-e </tt><i>script-source</i>
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<blockquote>Executes <i>script-source</i> as a JavaScript script.</blockquote>
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<tt>-f </tt><i>script-filename</i>
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<blockquote>Reads filename specified by <i>script-filename</i> and executes
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it as a JavaScript script.</blockquote>
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<tt>-opt </tt><i>optLevel</i>
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<br><tt>-O</tt> <i>optLevel</i>
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<ul>Optimizes at level <i>optLevel</i>, which must be an integer between
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0 and 9. See <a href="opt.html">Optimization</a> for more details.</ul>
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<tt>-version </tt><i>versionNumber</i>
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<ul>Specifies the language version to compile with. The string <i>versionNumber</i>
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must be one of <tt>100</tt>, <tt>110</tt>, <tt>120</tt>, <tt>130</tt>,
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or <tt>140</tt>. See <a href="overview.html#versions">JavaScript Language
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Versions</a> for more information on language versions.</ul>
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<h2>
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Predefined Properties</h2>
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Scripts executing in the shell have access to some additional properties
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of the top-level object.
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<br>
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<h4>
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arguments</h4>
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<blockquote>The <tt>arguments</tt> object is an array containing the strings
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of all the arguments given at the command line when the shell was invoked.</blockquote>
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<h4>
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help()</h4>
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<blockquote>Executing the help function will print usage and help messages.</blockquote>
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<h4>
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defineClass(<i>className</i>)</h4>
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<blockquote>Define an extension using the Java class named with the string
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argument <i>className</i>. Uses ScriptableObject.defineClass() to define
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the extension.</blockquote>
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<h4>
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load([<i>filename</i>, ...])</h4>
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<blockquote>Load JavaScript source files named by string arguments. If
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multiple arguments are given, each file is read in and executed in turn.</blockquote>
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<h4>
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loadClass(<i>className</i>)</h4>
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<blockquote>Load and execute the class named by the string argument <i>className</i>.
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The class must be a class that implements the Script interface, as will
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any script compiled by <a href="jsc.html">jsc</a>.</blockquote>
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<h4>
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print([<i>expr</i> ...])</h4>
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<blockquote>Evaluate and print expressions. Evaluates each expression,
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converts the result to a string, and prints it.</blockquote>
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<h4>
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quit()</h4>
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<blockquote>Quit shell. The shell will also quit in interactive mode if
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an end-of-file character is typed at the prompt.</blockquote>
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<h4>
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version([<i>number</i>])</h4>
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<blockquote>Get or set JavaScript version number. If no argument is supplied,
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the current version number is returned. If an argument is supplied, it
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is expected to be one of <tt>100</tt>, <tt>110</tt>, <tt>120</tt>, <tt>130,</tt>
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or <tt>140</tt> to indicate JavaScript version 1.0, 1.1, 1.2, 1.3, or 1.4
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respectively.</blockquote>
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<h2>
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Example</h2>
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Here the shell is invoked three times from the command line. (The system
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command prompt is shown as <tt>$</tt>.) The first invocation executes a
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script specified on the command line itself. The next invocation has no
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arguments, so the shell goes into interactive mode, reading and evaluating
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each line as it is typed in. Finally, the last invocation executes a script
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from a file and accesses arguments to the script itself.
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<p><tt>$ java org.mozilla.javascript.tools.shell.Main -e print('hi')</tt>
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<p><tt>hi</tt>
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<p><tt>$ java org.mozilla.javascript.tools.shell.Main</tt>
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<p><tt>js> print('hi')</tt>
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<br><tt>hi</tt>
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<br><tt>js> 6*7</tt>
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<br><tt>42</tt>
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<br><tt>js> function f() {</tt>
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<br><tt> return a;</tt>
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<br><tt>}</tt>
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<br><tt>js> var a = 34;</tt>
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<br><tt>js> f()</tt>
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<br><tt>34</tt>
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<br><tt>js> quit()</tt>
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<p><tt>$ cat echo.js</tt>
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<br><tt>for (i in arguments) {</tt>
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<br><tt> print(arguments[i])</tt>
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<br><tt>}</tt>
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<br><tt>$ java org.mozilla.javascript.tools.shell.Main echo.js foo bar</tt>
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<p><tt>foo</tt>
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<br><tt>bar</tt>
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<p><tt>$</tt>
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<p>
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<hr WIDTH="100%">
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<br><a href="index.html">back to top</a>
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</body>
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</html>
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