Summary of the use of parentElement, srcElement

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:///TR/xhtml1/DTD/">
<html xmlns="http:///1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Unt titled document</title>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script type="text/ecmascript">
function tdClick(){
if(()=='td'){
alert("row:"+(+1)+"column:"+(+1));
//alert("line:"+(+1));
}
}
</script>
</head>
<body>