JS printing gridview implementation principle and code_javascript skills

var hkey_root = "HKEY_CURRENT_USER";
var hkey_path = "\ Software\Microsoft\Internet Explorer\PageSetup\";
var hkey_key;
function printPage() {
try {
var RegWsh = new ActiveXObject("WScript.Shell");
hkey_key = "header"
RegWsh.RegWrite(hkey_root hkey_path hkey_key, "&w&bpage number, &p/&P")
hkey_key = "footer"
RegWsh.RegWrite(hkey_root hkey_path hkey_key, "") //Removed &u Because I don’t want to display the URL of the current printed page
hkey_key = "margin_bottom";
RegWsh.RegWrite(hkey_root hkey_path hkey_key, "0.39"); //0.39 is equivalent to setting the margin in the page settings to 10
hkey_key = "margin_left";
RegWsh.RegWrite(hkey_root hkey_path hkey_key, "0.39");
hkey_key = "margin_right";
RegWsh.RegWrite(hkey_root hkey_path hkey_key, "0.39");
hkey_key = "margin_top";
RegWsh.RegWrite(hkey_root hkey_path hkey_key, "0.39");
}
catch (e) { }
var headstr = "< ;head> ";
var footstr = "";
var newWin = window.open('printer', '', '');
var titleHTML = document.getElementById("printdiv").innerHTML;
newWin.document.write(headstr titleHTML footstr);
newWin.document.location.reload();
newWin.print( );
// newWin.close();
}