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242 строки
11 KiB
HTML
242 строки
11 KiB
HTML
<!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] (WinNT; I) [Netscape]">
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<meta name="KeyWords" content="Rhino, JavaScript, Java, Debugger">
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<title>Rhino Debugger</title>
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</head>
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<body bgcolor="#FFFFFF">
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<script src="owner.js">
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</script>
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<center>
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<h1>
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Rhino JavaScript Debugger</h1></center>
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Christopher Oliver
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<br><script>document.write(owner());</script>
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<br>6/28/2001
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<center>
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<hr WIDTH="100%"></center>
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The Rhino JavaScript debugger is a GUI that allows debugging of interpreted
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JavaScript scripts run in Rhino. Note that this debugger <i>will not</i>
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work with JavaScript scripts run in the mozilla browser since Rhino is
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not the engine used in such environments.
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<p><img SRC="jsdebug.jpg" height=460 width=600>
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<p>Current limitations:
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<ul>
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<li>
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Requires JDK 1.2 or greater</li>
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<li>
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Requires js.jar from rhinoTip.zip</li>
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<li>
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No breakpoint menu</li>
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</ul>
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<b><font face="Arial"><font color="#000080"><font size=+2>Using the Rhino
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JavaScript Debugger</font></font></font></b>
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<p><font size=-1>The Mozilla Rhino JavaScript engine includes a source-level
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debugger for debugging JavaScript scripts. The debugger is itself a Java
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program which you may run as</font>
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<ol><font face="Arial"><font size=-1>java org.mozilla.javascript.tools.debugger.Main
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[options] [filename.js] [script-arguments]</font></font></ol>
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<font size=-1>where the options are the same as the shell.</font>
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<p><font size=-1>The Rhino JavaScript Debugger can debug scripts running
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in multiple threads and provides facilities to set and clear breakpoints,
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control execution, view variables, and evaluate arbitrary JavaScript code
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in the current scope of an executing script.</font>
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<p><a NAME="_Toc502165109"></a><b><font face="Arial"><font color="#000080"><font size=-1>Console
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Window</font></font></font></b>
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<br><font size=-1>The debugger redirects the <font face="Arial">System.out</font>,
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<font face="Arial">System.in</font>,
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and <font face="Arial">System.err</font> streams to an internal JavaScript
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console window which provides an editable command line for you to enter
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JavaScript code and view system output. The console window maintains a
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history of the commands you have entered. You may move backward and forward
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through the history list by pressing the Up/Down arrow keys on the keyboard.</font>
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<br><a NAME="_Toc502165110"></a><b><font face="Arial"><font color="#000080"><font size=-1>Opening
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Scripts</font></font></font></b>
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<br><font size=-1>You may select the <b><i>File->Open</i></b> menu item
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on the menu bar to load JavaScript scripts contained in files. This action
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will display a file-selection dialog box prompting you for the location
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of a script to load. The selected file will be compiled and displayed in
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a new window.</font>
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<br><a NAME="_RunningScripts"></a><b><font face="Arial"><font color="#000080"><font size=-1>Running
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Scripts</font></font></font></b>
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<br><font size=-1>You may select the <b><i>File->Run</i></b> menu item
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on the menu bar to execute JavaScript scripts contained in files. This
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action will display a file-selection dialog box prompting you for the location
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of a script to execute. The loaded script will be run in a new thread and
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control will be given to the debugger on its first instruction.</font>
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<p><a NAME="_Toc502165111"></a><b><font face="Arial"><font color="#000080"><font size=+1>Controlling
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Execution</font></font></font></b>
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<br><font size=-1>The debugger provides the following facilities for you
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to control the execution of scripts you are debugging:</font>
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<p><b><font face="Arial"><font color="#000080">Step Into</font></font></b>
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<br><font size=-1>To single step entering any function calls, you may do
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any of the following:</font>
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<ul>
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<li>
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<font size=-1>Select the <b><i>Debug->Step Into </i></b>menu item on the
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menu bar</font></li>
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<li>
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<font size=-1>Press the <b><i>Step Into</i></b> button on the toolbar</font></li>
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<li>
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<font size=-1>Press the F11 key on the keyboard</font></li>
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</ul>
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<font size=-1>Execution will resume. If the current line in the script
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contains a function call control will return to the debugger upon entry
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into the function. Otherwise control will return to the debugger at the
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next line in the current function.</font>
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<p><b><font face="Arial"><font color="#000080">Step Over</font></font></b>
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<br><font size=-1>To single step to the next line in the current function,
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you may do any of the following:</font>
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<ul>
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<li>
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<font size=-1>Select the <b><i>Debug->Step Over</i></b> menu item on the
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menu bar</font></li>
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<li>
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<font size=-1>Press the <b><i>Step Over</i></b> button on the toolbar</font></li>
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<li>
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<font size=-1>Press the F7 key on the keyboard</font></li>
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</ul>
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<font size=-1>Execution will resume but control will return to the debugger
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at the next line in the current function or top-level script.</font>
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<p><b><font face="Arial"><font color="#000080">Step Out</font></font></b>
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<br><font size=-1>To continue execution until the current function returns
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you may do any of the following:</font>
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<ul>
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<li>
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<font size=-1>Select the <b><i>Debug->Step Out</i></b> menu item on the
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menu bar</font></li>
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<li>
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<font size=-1>Press the <b><i>Step Out</i></b> button on the toolbar</font></li>
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<li>
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<font size=-1>Press the F8 key on the keyboard</font></li>
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</ul>
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<font size=-1>Execution will resume until the current function returns
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or a breakpoint is hit.</font>
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<p><b><font face="Arial"><font color="#000080">Go</font></font></b>
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<br><font size=-1>To resume execution of a script you may do any of the
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following:</font>
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<ul>
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<li>
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<font size=-1>Select the <b><i>Debug->Go</i></b> menu item on the menu
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bar</font></li>
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<li>
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<font size=-1>Press the <b><i>Go</i></b> button on the toolbar</font></li>
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<li>
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<font size=-1>Press the F5 key on the keyboard</font></li>
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</ul>
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<font size=-1>Execution will resume until a breakpoint is hit or the script
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completes.</font>
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<p><b><font face="Arial"><font color="#000080">Break</font></font></b>
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<br><font size=-1>To stop all running scripts and give control to the debugger
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you may do any of the following:</font>
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<ul>
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<li>
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<font size=-1>Select the <b><i>Debug->Break</i></b> menu item on the menu
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bar</font></li>
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<li>
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<font size=-1>Press the <b><i>Break</i></b> button on the toolbar</font></li>
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<li>
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<font size=-1>Press the Pause/Break key on the keyboard</font></li>
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</ul>
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<a NAME="_RunningScripts"></a><b><font face="Arial"><font color="#000080"><font size=-1>Break
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on Exceptions</font></font></font></b>
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<br><font size=-1>To give control to the debugger whenever a JavaScript
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is exception is thrown select the <b><i>Debug->Break on Exceptions</i></b>
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checkbox from the menu bar. Whenever a JavaScript exception is thrown
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by a script a message dialog will be displayed and control will be given
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to the debugger at the location the exception is raised.</font>
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<p><a NAME="_Toc502165112"></a><b><font face="Arial"><font color="#000080">Moving
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Up and Down the Stack</font></font></b>
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<br><font size=-1>The lower-left (dockable) pane in the debugger main window
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contains a combo-box labeled "Context:" which displays the current stack
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of the executing script. You may move up and down the stack by selecting
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an entry in the combo-box. When you select a stack frame the variables
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and watch windows are updated to reflect the names and values of the variables
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visible at that scope.</font>
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<p><a NAME="_Toc502165113"></a><b><font face="Arial"><font color="#000080">Setting
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and Clearing Breakpoints</font></font></b>
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<br><font size=-1>The main desktop of the debugger contains file windows
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which display the contents of each script you are debugging. You may set
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a breakpoint in a script by doing one of the following:</font>
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<ul>
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<li>
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<font size=-1>Place the cursor on the line at which you want to set a breakpoint
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and right-click with the mouse. This action will display a pop-up menu.
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Select the <b><i>Set Breakpoint</i></b> menu item.</font></li>
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<li>
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<font size=-1>Simply single-click on the line number of the line at which
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you want to set a breakpoint.</font></li>
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</ul>
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<font size=-1>If the selected line contains executable code a red dot will
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appear next to the line number and a breakpoint will be set at that location.</font>
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<p><font size=-1>You may clear breakpoint in a script by doing one of the
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following:</font>
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<ul>
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<li>
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<font size=-1>Place the cursor on the line at which you want to clear a
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breakpoint and right-click with the mouse. This action will display a pop-up
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menu. Select the <b><i>Clear Breakpoint</i></b> menu item.</font></li>
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<li>
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<font size=-1>Simply single-click on the red dot or the line number of
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the line at which you want to clear a breakpoint.</font></li>
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</ul>
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<font size=-1>The red dot will disappear and the breakpoint at that location
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will be cleared.</font>
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<p><a NAME="_Toc502165114"></a><b><font face="Arial"><font color="#000080"><font size=+1>Viewing
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Variables</font></font></font></b>
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<br><font size=-1>The lower-left (dockable) pane in the debugger main window
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contains a tab-pane with two tabs, labeled "this" and "Locals". Each pane
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contains a tree-table which displays the properties of the current object
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and currently visible local variables, respectively.</font>
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<p><b><font face="Arial"><font color="#000080">This</font></font></b>
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<br><font size=-1>The properties of the current object are displayed in
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the
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<b><i>this</i></b> table. If a property is itself a JavaScript object
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the property may be expanded to show its sub-properties. The <b><i>this</i></b>
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table is updated each time control returns to the debugger or when you
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change the stack location in the <b><i>Context:</i></b> window.</font>
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<p><b><font face="Arial"><font color="#000080">Locals</font></font></b>
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<br><font size=-1>The local variables of the current function are displayed
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in the <b><i>Locals</i></b> table. If a variable is itself a JavaScript
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object the variable may be expanded to show its sub-properties. The <b><i>Locals</i></b>
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table is updated each time control returns to the debugger or when you
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change the stack location in the <b><i>Context:</i></b> window</font>
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<p><a NAME="_Toc502165116"></a><b><font face="Arial"><font color="#000080">Watch
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Window</font></font></b>
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<br><font size=-1>You may enter arbitrary JavaScript expressions in the
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<b><i>Watch:</i></b>
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table located in the lower-right (dockable) pane in the debugger main window.
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The expressions you enter are re-evaluated in the current scope and their
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current values displayed each time control returns to the debugger or when
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you change the stack location in the <b><i>Context:</i></b> window.</font>
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<p><a NAME="_Toc502165117"></a><b><font face="Arial"><font color="#000080">Evaluation
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Window</font></font></b>
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<br><font size=-1>The <b><i>Evaluate</i></b> pane located in the lower-right
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(dockable) pane in the debugger main window contains an editable command
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line where you may enter arbitrary JavaScript code. The code is evaluated
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in the context of the current stack frame. The window maintains a history
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of the commands you have entered. You may move backward or forward through
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the history by pressing the Up/Down arrow keys on the keyboard.</font>
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</body>
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</html>
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