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用 onerror 获取错误信

http://www.iyit.net 日期：2006-5-5 9:45:08 来源：蓝色理想点击：

【参加讨论】

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！

运行代码框
<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="<a href=http://www.iyit.net/html/bckf/java/index.html target=_blank>java</a>script">// coded by windy_sk <windy_sk@126.com> 20040205function 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>

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