同時可將提示文字修正壹下,標示錯誤信息.
<script language="JavaScript">
<!--
var s, flag = false;
while(flag == false) {
s = window.prompt("hello");
flag = true;
for(i=0; i<s.length; i++) {
var c = s.charAt(i);
if(c == "'" || c == '"') {
flag = false;
break;
}
}
}
alert(s + " is valid string");
//-->
</script>