Send JS error log to server

JS record error log/catch error

OnError provides three parameters for exception information, file paths, and the number of rows where the error code occurs.

Window.onerror = function (e,url,index) {var msg = E.message | | e| | "Unknown error"; Alert ("error message:" +msg+ ", Error Path:" +ul+ ", line number:" +index "); }

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var logger = (function(){     var loghost = ‘http://127.0.0.1/log.gif?‘;     var log = function(err){         var img = new Image(0,0);         var _url =[];         _url.push(‘name‘+‘=‘+encodeURIComponent(err.name));         _url.push(‘message‘+‘=‘+encodeURIComponent(err.message));         _url.push(‘location‘+‘=‘+encodeURIComponent(err.location));         if(err.line)             _url.push(‘line‘+‘=‘+encodeURIComponent(err.line));         if(err.func)             _url.push(‘func‘+‘=‘+encodeURIComponent(err.func));        var url = _url.join(‘&‘);         img.src = loghost+url;         console.log(img.src);     }     return {log:log}; })();function trapError(msg, URI, ln) {     // wrap our unknown error condition in an object     var error = new Error(msg);     error.location = URI; // add custom property     error.line = ln;     logger.log(error);     warnUser();     return true; // stop the yellow triangle }window.onerror = trapError;function foo() {     try {         riskyOperation();     } catch (err) {         // add custom property         err.location = location.href;         err.func = ‘foo‘;         logger.log(err);         warnUser();     } } function warnUser() {     alert("An error has occurred while processing this page.\         Our engineers have been alerted!");     // do something } foo();