如何追踪JS错误

<?php
$logContent = '<div style="border:1px solid #FF4500;background-color:#FFDAB9">';
$logContent .= 'Time: '.date("Y-m-d H:i:s")."\r\n";
$logContent .= 'Page: '.$_POST['page']."\r\n";
$logContent .= 'errorMessage:'.$_POST['errorMessage']."\r\n";
$logContent .= 'lineNumber:'.$_POST['lineNumber']."\r\n";
$logContent .= 'User-Agent:'.$_SERVER['HTTP_USER_AGENT']."\r\n";
$logContent .=  '</div>';
$logContent = '<pre>'.$logContent.'</pre>';
file_put_contents(date("Y-m-d").'.log.html', $logContent, LOCK_EX | FILE_APPEND);

window.onerror = function(errorMessage, scriptURL, lineNumber) {
	$.post("write.php", { errorMessage:errorMessage,lineNumber:lineNumber,page:scriptURL});
}