请教各位，这个函数应该如何修改才能更加完善？

[handsomekyle]

function macFormCheck(mac) {
    var macs = new Array();
    macs = mac.split("_"); 
    if(macs.length != 6){ 
    	alert("The MAC you input is invalid!Please input a mac like xx_xx_xx_xx_xx_xx (xx should be sexadecimal number)! ");
		isOK = 0 ;
    	return null ;
	  }
    for (var s=0; s<6; s++) { 
    	var temp = parseInt(macs[s],16);  
    	if(macs[s].length > 2 ||macs[s].length < 2  )  
		{
        	alert("The MAC you input is invalid!Please input a mac like xx_xx_xx_xx_xx_xx (xx should be sexadecimal number)! ");
			isOK = 0 ;
    		return null ;
		}
    	if(isNaN(temp))  
		{
        	alert("The MAC you input is invalid!Please input a mac like xx_xx_xx_xx_xx_xx (xx should be sexadecimal number)! ");
			isOK = 0 ;
    		return null;
		}
    	if(temp < 0 || temp > 255 )  
		{
        	alert("The MAC you input is invalid!Please input a mac like xx_xx_xx_xx_xx_xx (xx should be sexadecimal number)! ");
			isOK = 0 ;
    		return null ;
		}
    }
	  isOK = 1 ;
    return mac;
}

代码如上，我是想做一个检查输入的MAC地址合法性的函数，但是判断功能不是很完善。
请教各位应该如何修改。

[knightzhuwei]

你是觉得哪里不完善呢

[likeajin]

function macFormCheck(mac) {
    mac = mac + '';
    if(/^[A-F\d]{2}(_[A-F\d]{2}){5}$/.test(mac))return mac;
    alert("The MAC you input is invalid!Please input a mac like xx_xx_xx_xx_xx_xx (xx should be sexadecimal number)!");
    return null
};
var ms = ['00_0F_12_AF_FF_FE', 'ab_0F_12_AF_FF_FE', '001_0F_12_AF_FF_FE'];
for(var i = ms.length - 1; i >= 0; i--)alert(ms[i] + '\r\n' + macFormCheck(ms[i]))

[handsomekyle]

引用 1 楼 knightzhuwei 的回复:

你是觉得哪里不完善呢

我发现当我输入的结尾是f和一个超过f的字母的组合时 没有判断出来

[likeajin]

引用 2 楼 likeajin 的回复:

JavaScript code?12345678function macFormCheck(mac) { mac = mac + ''; if(/^[A-F\d]{2}(_[A-F\d]{2}){5}$/.test(mac))return mac; alert("The MAC you input is invalid!Please input a ma……

如果字母可以是小写，把正则表达式/^[A-F\d]{2}(_[A-F\d]{2}){5}$/改为： /^[A-F\d]{2}(_[A-F\d]{2}){5}$/i

[handsomekyle]

引用 4 楼 likeajin 的回复:

引用 2 楼 likeajin 的回复:JavaScript code?12345678function macFormCheck(mac) { mac = mac + ''; if(/^[A-F\d]{2}(_[A-F\d]{2}){5}$/.test(mac))return mac; alert("The MAC you input is inval……

感谢！ 这个正则表达式还真是好用、、、回头我得买一本JS的书好好看看

[handsomekyle]

引用 2 楼 likeajin 的回复:

JavaScript code?12345678function macFormCheck(mac) { mac = mac + ''; if(/^[A-F\d]{2}(_[A-F\d]{2}){5}$/.test(mac))return mac; alert("The MAC you input is invalid!Please input a ma……

函数的使用我是这么使用的

function macFormCheck() {
   with ( document.forms[0] ) { 
    	var mac = MAC.value + '';
    	if(/^[A-Fd]{2}(_[A-Fd]{2}){5}$/i.test(mac))return true; 
    	alert("The MAC you input is invalid!Please input a mac like xx_xx_xx_xx_xx_xx (xx should be sexadecimal number)!"); 
    	return false ;
	  }
}

为什么我输入一个11_22_33_44_55_55，却总是走到提示那一步呢？

[likeajin]

引用 6 楼 handsomekyle 的回复:

引用 2 楼 likeajin 的回复:JavaScript code?12345678function macFormCheck(mac) { mac = mac + ''; if(/^[A-F\d]{2}(_[A-F\d]{2}){5}$/.test(mac))return mac; alert("The MAC you input is inval……

正则错了。 /^[A-F\d]{2}(_[A-F\d]{2}){5}$/i 注意d前面的\，估计是转义字符引起错误

[Kilin_Zhang]

/^(?:[\da-f]{2,2}-){7,7}[\da-f]{2,2}$/i