new command: run javascript.

runs your current selection or document in an html output window. You can do console messages and check the html output window's console.
includes support for window.alert and window.confirm from Hans-Jörg Bibiko
properly corrects for line numbers in error messages

Commands/Run Javascript.tmCommand

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>beforeRunningCommand</key>
+	<string>nop</string>
+	<key>command</key>
+	<string>#!/usr/bin/env bash
+. "$TM_SUPPORT_PATH/lib/webpreview.sh"
+html_header "Javascript Runner" "Open Web Inspector for log"
+
+YOURCODE=`cat`
+
+cat &lt;&lt;HTML
+&lt;script&gt;
+(function(){try{
+	
+	function e_sh(s){
+		return s
+		.toString()
+		.replace(/\x27/g,"’")
+		.replace(/\"/g,'\\\"')
+		;
+	};
+	
+	window.alert = function(s){
+		TextMate.system('"$DIALOG" -e -p \'{messageTitle="JavaScript";informativeText="'+e_sh(s)+'";}\'', null);
+	};
+	
+	var __TM_confirm_Status;
+	window.confirm = function(s){
+		TextMate.system('"$DIALOG" -e -p \'{messageTitle="JavaScript";informativeText="'+e_sh(s)+'";buttonTitles=("OK","Cancel");}\'', null)
+		.onreadoutput = function(s){ __TM_confirm_Status = s != 1; };
+		return(__TM_confirm_Status);
+	};
+	
+}catch(e){ console.log(e.message); }; })();
+&lt;/script&gt;
+&lt;pre id="log"&gt;
+$YOURCODE
+&lt;script&gt;
+try{throw {}}catch(e){ window.__line=(e.line||0) + 3 };
+try{
+/*----  YOUR CODE ----*/
+$YOURCODE
+/*---- /YOUR CODE ----*/
+}catch(e){
+	console.log(e);
+	var __line_offset = ${TM_INPUT_START_LINE:-1};
+	alert("$TM_FILEPATH:" + ((e.line||1) - __line + __line_offset) +"\n"+ e.message||'')
+};
+&lt;/script&gt;&lt;/pre&gt;
+HTML
+
+html_footer
+</string>
+	<key>input</key>
+	<string>selection</string>
+	<key>keyEquivalent</key>
+	<string>@r</string>
+	<key>name</key>
+	<string>Run Javascript</string>
+	<key>output</key>
+	<string>showAsHTML</string>
+	<key>scope</key>
+	<string>source.js</string>
+	<key>uuid</key>
+	<string>EA26235D-2A24-4ED4-8BC2-5424B9E80CFF</string>
+</dict>
+</plist>