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首页 > 站长学院 > Dreamweaver > 用 onerror 获取错误信息
 

用 onerror 获取错误信息

日期：2005-04-05 00:00:00  来源：中国站长学院
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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: nn";
 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(/rn/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(/rn/g, 'rt');
    code = code.replace(/rn/g, 'rt');
    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 = 'rn' + 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: nn';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' '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%' '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'>&nbsp;&nbsp;
              <input type='button' value=' 保 存 ' onclick='savecode()' accesskey='s'>&nbsp;&nbsp;
              <input type='button' value=' 跳 转 ' onclick="goto(prompt('Please input the line number', '1'))"  accesskey='g'>&nbsp;&nbsp;
            </td>
          </tr>
        </table>
    </td>
  </tr>
</table>
</BODY>
</HTML>


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