分享程序员开发的那些事...
更新时间：2022-04-27 23:00:58
答案代码如下，
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Change caps to small</title>
<script type="text/javascript">
var bx, chr, indx, intvl, last, lng, ln2, str, tmp;
function PrepBox()
{
bx = document.getElementById("txtbx");
last = ""; //this will be the manipulated string
lng = 0; //its length
intvl = setInterval("txtchk();", 100); //ten times per second
return;
}
function txtchk()
{
tmp = bx.value;
ln2 = tmp.length;
if(ln2 < lng) //test for backspace
last = tmp.substr(0,ln2); //shorten the manipulated string
else if(ln2 > lng)
{
str = tmp.substr(lng); //get newly-typed character(s)
for(indx=0; indx<str.length; indx++) //for each one of them
{
chr = str.charAt(indx);
if((chr >= "a") && (chr <= "z"))
last += chr.toUpperCase(); //change lowercase to upper
else if((chr >= "A") && (chr <= "Z"))
last += chr.toLowerCase(); //change uppercase to lower
else
last += chr; //periods, commas, semicolons, ...
}
}
lng = ln2; //update saved-length of "last"
bx.value = last; //replace text in box with manipulated string
return;
}
</script>
</head>
<body>
<input id="txtbx" size="50" maxlength="40" type="text" style="font-size:10pt;" onFocus="PrepBox();" />
</body>
</html>
输出：
1。如果大写锁定已关闭，则默认输入文本为大写，如果我按Shift键输入文本，则会更改为小。
2。如果打开大写锁定，默认输入文本很小，如果我按Shift键输入文本，则更改为大写。