jquery：只能让输入的内容是1-9、a-f。否则就变为0

时间：2021-11-18 11:33:41
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>mac</title>
<script type="text/javascript" src="http://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
	$("#mac").keyup(function(){
		var CurrentMacContent = $("#mac").val();
		$("#mac").val( updateInputMacChar( window.event.keyCode,CurrentMacContent ));
		$("#mac").val( forceToNum(CurrentMacContent) );									//用户连续按某个键后的处理
	});
});

function updateInputMacChar( MacChar , MacContent ){									//更改用户输入的最后一个字符				
	var CheckFlag = false;
	var NewMacContent = '';

	if( typeof( MacChar ) == 'undefined' ) renturn;
	if( typeof( MacContent ) == 'undefined' ) renturn;
	if( MacChar === '') renturn;
	if( MacContent === '') renturn;

	CheckFlag = checkInputMacChar(MacChar);
	if( CheckFlag == false ){
		if( MacContent.split("").length == 1) NewMacContent = '';		//只输入一个字符的情况
		for( var p = 0 ; p < MacContent.split("").length-1 ; p++ ){
			NewMacContent += MacContent.split("")[p];
		}
	}else{
		NewMacContent = MacContent;
	}
	return NewMacContent;
}
function checkInputMacChar(MacChar){													//检测是否是合法字符,'1' 'a' 'A' 49 65
	var CheckFlag = false;
	for( var i = 48; i <= 57 ; i++ ){			//0-9
		if( (MacChar == i)){<span style="white-space:pre">				</span>//键盘输入的字符keyCode，即对应asii值
			CheckFlag = true;
			return CheckFlag;
		}
		try{<span style="white-space:pre">						</span>//split拆分字符串得到的字符，即对应单个字符，得转换成asii值才能比较。
			if( (MacChar.charCodeAt(0) == i)){
				CheckFlag = true;
				return CheckFlag;
			}
		}catch(exception){
		}
	}
	if( CheckFlag == false ){
		for( var j = 65; j <= 70 ; j++ ){		//a-f
			if( MacChar == j ){<span style="white-space:pre">			</span><span style="font-family: Arial, Helvetica, sans-serif;">//键盘输入的字符keyCode，即对应asii值</span><span style="white-space:pre">
</span>				CheckFlag = true;
				return CheckFlag;
			}
			try{
				if( (MacChar.charCodeAt(0) == j)){<span style="white-space:pre">	</span><span style="font-family: Arial, Helvetica, sans-serif;">//split拆分字符串得到的大写字符，即对应单个字符，得转换成asii值才能比较。</span>

					CheckFlag = true;
					return CheckFlag;
				}
			}catch(exception){
			}
		}
	}
	if( CheckFlag == false ){
		for( var j = 97; j <= 102 ; j++ ){		//a-f
			try{
				if( (MacChar.charCodeAt(0) == j)){<span style="white-space:pre">	</span><span style="font-family: Arial, Helvetica, sans-serif;">//split拆分字符串得到的小写字符，即对应单个字符，得转换成asii值才能比较。</span><span style="white-space:pre">
</span>					CheckFlag = true;
					return CheckFlag;
				}
			}catch(exception){
			}
		}
	}
}

function forceToNum(MacContent){														//检测所有的字符是否有不合法的										
	var NewMacContent = '';
	if( typeof( MacContent ) == 'undefined' ) renturn;
	if( MacContent == '') renturn;
	for( var i = 0 ; i < MacContent.split("").length ; i++){
		if( checkInputMacChar( MacContent.split("")[i] ) ){<span style="white-space:pre">	</span>//只要是非法字符，就用0代替。
			NewMacContent += MacContent.split("")[i];
		}else{
			NewMacContent += '0';
		}
	}
	return NewMacContent;
}
</script>
</head>

<body>
<input type="input" id="mac">
<div  id="keycode"></div>
</body>
</html>

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