这个东西是在线写 js 脚本的时候，用来即时查错的东西！
也就是，当发现所编写的脚本有问题的时候会有相应的提示，并且在源代码框中高亮标示出错行，方便除错！
<HTML>
<HEAD>
<TITLE>Debug Textarea</TITLE>
<meta http-equiv='Content-Type' content='text/html; charset=gb2312'>
</HEAD>
<style>
* {
font-size: 12px
}
body {
margin: 10px; padding: 0px
}
table.list{
cursor: default;
border:1px solid #cccccc
background-color: #cccccc;
border-collapse: collapse;
border-Color: #cccccc;
}
</style>
<script language="javascript">
// Coded by windy_sk <windy_sk@126.com> 20040205
function reportError(msg,url,line) {
var str = "You have found an error as below: \n\n";
str += "Err: " + msg + " on line: " + line;
alert(str);
return true;
}
window.onerror = reportError;
document.onkeydown = function() {
if(event.ctrlKey){
switch(event.keyCode) {
case 82: //r
runcode();
break;
case 83: //s
savecode();
break;
case 71: //g
goto(prompt('Please input the line number', '1'));
break;
case 65: //a
document.execCommand("SelectAll");
break;
case 67: //c
document.execCommand("Copy");
break;
case 88: //x
document.execCommand("Cut");
break;
case 86: //v
document.execCommand("Paste");
break;
case 90: //z
document.execCommand("Undo");
break;
case 89: //y
document.execCommand("Redo");
break;
default:
break;
}
event.keyCode = 0;
event.returnValue = false;
}
return;
}
function show_ln(){
var txt_ln = document.getElementById('txt_ln');
var txt_main = document.getElementById('txt_main');
txt_ln.scrollTop = txt_main.scrollTop;
while(txt_ln.scrollTop != txt_main.scrollTop) {
txt_ln.value += (i++) + '\n';
txt_ln.scrollTop = txt_main.scrollTop;
}
return;
}
function editTab(){
var code, sel, tmp, r;
event.returnValue = false;
sel =event.srcElement.document.selection.createRange();
r = event.srcElement.createTextRange();
switch (event.keyCode){
case (8) :
if (!(sel.getClientRects().length > 1)){
event.returnValue = true;
return;
}
code = sel.text;
tmp = sel.duplicate();
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top);
if(sel.parentElement() != tmp.parentElement()) return;;
sel.setEndPoint('startToStart', tmp);
sel.text = sel.text.replace(/^\t/gm, '');
code = code.replace(/^\t/gm, '').replace(/\r\n/g, '\r');
r.findText(code);
r.select();
break;
case (9) :
if (sel.getClientRects().length > 1){
code = sel.text;
tmp = sel.duplicate();
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top);
if(sel.parentElement() != tmp.parentElement()) return;
sel.setEndPoint('startToStart', tmp);
sel.text = '\t'+sel.text.replace(/\r\n/g, '\r\t');
code = code.replace(/\r\n/g, '\r\t');
r.findText(code);
r.select();
}else{
sel.text = '\t';
sel.select();
}
break
case (13) :
tmp = sel.duplicate();
tmp.moveToPoint(r.getBoundingClientRect().left, sel.getClientRects()[0].top);
if(sel.parentElement() != tmp.parentElement()) return;
tmp.setEndPoint('endToEnd', sel);
sel.text = '\r\n' + tmp.text.replace(tmp.text.replace(/^[\t ]+/g, ""),"");
sel.select();
break;
default :
event.returnValue = true;
break;
}
return;
}
function runcode() {
var str = document.getElementById("txt_main").value;
var code_win = window.open('about:blank');
code_win.document.open();
code_win.document.writeln("<script>");
code_win.document.writeln("function reportError(msg,url,line){\nline-=14;\nvar str='You have found an error as below: \\n\\n';\nstr+='Err: '+msg+' on line: '+(line);\nalert(str);\nopener.goto(line);\nopener.focus();\nwindow.onerror=null;\nsetTimeout('self.close()',10);\nreturn true;\n}");
code_win.document.writeln("window.onerror = reportError;");
code_win.document.writeln("<\/script>");
code_win.document.writeln(str);
code_win.document.close();
return;
}
function savecode() {
var str = document.getElementById("txt_main").value;
var code_win = window.open('about:blank','_blank','top=10000');
code_win.document.open();
code_win.document.writeln(str);
code_win.document.close();
code_win.document.execCommand('saveas','','code.html');
code_win.close();
return;
}
function goto(ln) {
if(!/^\d+$/.test(ln) || ln==0) return;
var obj = document.getElementById("txt_main");
var rng = obj.createTextRange();
var arr = obj.value.split(/\n/);
if(ln>arr.length) ln = arr.length;
var str_tmp = "";
for(var i=0; i<ln-1; i++) {
str_tmp += arr[i];
}
rng.moveStart('character',str_tmp.length);
str_tmp = "";
for(i=ln; i<arr.length; i++) {
str_tmp += arr[i];
}
rng.moveEnd('character',-str_tmp.length);
rng.select();
return;
}
window.onload = function() {document.getElementById("txt_main").value = "<script>\nalert(')\n<\/script>";}
</script>
<BODY>
<table width='600' class='list' border='1' bgcolor='#eeeeee' bordercolorlight='#000000' bordercolordark='#FFFFFF' cellpadding='0' cellspacing='0'>
<tr bgcolor='#cccccc'>
<td colspan='2' height='20' align='center'><b>Debug Textarea</b></td>
</tr>
<tr>
<td colspan='2'>
<table width='95%' border='0' align='center' >
<tr>
<td align='center'><br />
<textarea id='txt_ln' name='content' rows='10' style='width:40px;overflow:hidden;height:200px;border-right:0px;text-align:right;line-height:14px' onselectstart='this.nextSibling.focus();return false' readonly></textarea><textarea id='txt_main' name='content' rows='10' cols='80' onkeydown='editTab()' onkeyup='show_ln()' onscroll='show_ln()' wrap='off' style='overflow:auto;height:200px;padding-left:5px;border-left:0px;line-height:14px'></textarea>
<script>for(var i=1; i<=20; i++) document.getElementById('txt_ln').value += i + '\n';</script>
</td>
</tr>
<tr>
<td align='center'><br />
<input type='button' value=' 运 行 ' onclick='runcode()' accesskey='r'>
<input type='button' value=' 保 存 ' onclick='savecode()' accesskey='s'>
<input type='button' value=' 跳 转 ' onclick="goto(prompt('Please input the line number', '1'))" accesskey='g'>
</td>
</tr>
</table>
</td>
</tr>
</table>
</BODY>
</HTML>