本文介绍如何使用JavaScript来监测用户在输入密码时大写锁定键的状态，确保密码输入过程中大写锁定键未被意外开启。
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>智能营销平台</title>
</head>
<body>
<div>
<input class="text" name="passwd" id="loginPasswd" type="password" style="*display:block;" />
<div style="color:#F90;padding:2px; position:absolute; display:none;" id="capital">大写锁定已开启</div>
<script type="text/javascript">
(function(){
var inputPWD = document.getElementById('loginPasswd');
var capital = false;
var capitalTip = {
elem:document.getElementById('capital'),
toggle:function(s){
var sy = this.elem.style;
var d = sy.display;
if(s){
sy.display = s;
}else{
sy.display = d =='none' ? '' : 'none';
}
}
}
var detectCapsLock = function(event){
if(capital){return};
var e = event||window.event;
var keyCode = e.keyCode||e.which; // 按键的keyCode
var isShift = e.shiftKey ||(keyCode == 16 ) || false ; // shift键是否按住
if (
((keyCode >= 65 && keyCode <= 90 ) && !isShift) // Caps Lock 打开，且没有按住shift键
|| ((keyCode >= 97 && keyCode <= 122 ) && isShift)// Caps Lock 打开，且按住shift键
){capitalTip.toggle('block');capital=true}
else{capitalTip.toggle('none');}
}
inputPWD.onkeypress = detectCapsLock;
inputPWD.onkeyup=function(event){
var e = event||window.event;
if(e.keyCode == 20 && capital){
capitalTip.toggle();
return false;
}
}
})()
</script>
</div>
</body>
</html>
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