程式設計@筆記

<script language="JavaScript">
var characters="0123456789abcdefghijklmnopqrstuvwxyz"
var passwordlength=8
function generatepassword() {
var password = ""
var n = 0
var randomnumber = 0
while( n < passwordlength ) {
n ++
randomnumber = Math.floor(characters.length*Math.random());
password += characters.substring(randomnumber,randomnumber + 1)
}

function RA(n1)
{
var optobj = document.getElementsByName(n1);
for(k=0;k<optobj.length;k++){
if(optobj.item(k).checked!=0)
{return true;
break;
}
}
return false;
}

<SCRIPT language=JavaScript>
<!-- begin
document.onmousedown=click;
document.onkeydown=click;
if (document.layers) window.captureEvents(Event.MOUSEDOWN); window.onmousedown=click;
if (document.layers) window.captureEvents(Event.KEYDOWN); window.onkeydown=click;
function click(e){
if (navigator.appName == 'Netscape'){
if (e.which != 1){
alert("無法使用！");
return false;}}
if (navigator.appName == "Microsoft Internet Explorer"){
if (event.button != 1){
alert("無法使用！");
return false;}}}
// end -->
</SCRIPT>

<script>
function referURL(url){
var isIe=(document.all)?true:false;
if(isIe) {
var linka = document.createElement('a');
linka.href=url;
document.body.appendChild(linka);
linka.click();
}else {
window.location = url;
}
}

function getExtension(path) {
var basename = path.split(/[\\/]/).pop(),
pos = basename.lastIndexOf(".");
if (basename === "" || pos < 1)
return "";

<script type="text/javascript">
<!--
width = screen.width;
height = screen.height;
availwidth = screen.availWidth;
availheight = screen.availHeight;
if (typeof(screen.deviceXDPI) == 'number') {
width *= screen.deviceXDPI/screen.logicalXDPI;
height *= screen.deviceYDPI/screen.logicalYDPI;
availwidth *= screen.deviceXDPI/screen.logicalXDPI;
availheight *= screen.deviceYDPI/screen.logicalYDPI;
}

 
<script>
function go(x){
document.form1.action=x;
document.form1.submit();
}
</script>
<form method="POST" name="form1">
<input type="button" value="del" name="B1" onclick="go('del.php');>
<input type="button" value="view" name="B2" onclick="go('view.php');">
<input type="button" value="addnew" name="B3" onclick="go('addnew.php');">
</form>

function checkSubmit(e) {
if(e && e.keyCode == 13) {
document.forms[0].submit();
}
}

如何在jQuery中選擇多個類的元素？

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$(function() {
$("#mm.aa.bb").click(function(){
alert('test');
});
});

問題：為未阻擋外來之frame問題，造成原始網站被蓋頁，請用下方程式進行阻擋
<script type="text/javascript">
if (top != self) top.location=encodeURI(self.location)
</script>