Eval Function
<html> <head></head> <body> <script>
x=prompt("Give command: ");
eval(x);
</script> </body> </html>
Alert Function
<html> <head></head> <body> <script>
x=prompt("Give me a message: ");
alert(x);
</script> </body> </html>
ParseInt, ParseFloat, isNaN
<html> <head></head> <body> <script>
x=prompt("Give me a number: ");
if(!isNaN(x)){
document.write(parseInt(x),"<br>");
document.write(parseFloat(x),"<br>");
}
else {
alert("Not a valid number.");
}
</script> </body> </html>
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