js 身份证验证

 
<html>
<title></title>
<head>
<script>

function checkIdCard(){
	var v_card = document.getElementById("card").value;
	
	var iW = new Array(7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2,1);
	iSum = 0;
	for( i=0;i<17;i++){
		iC = v_card.charAt(i) ;
		iVal = parseInt(iC);
		iSum += iVal * iW[i];
	}

	iJYM = iSum % 11;
	var sJYM = '';
	if(iJYM == 0) sJYM = "1";

	else if(iJYM == 1 ) sJYM = "0";
	else if(iJYM == 2 ) sJYM = "x";
	else if(iJYM == 3 ) sJYM = "9";
	else if(iJYM == 4 ) sJYM = "8";
	else if(iJYM == 5 ) sJYM = "7";
	else if(iJYM == 6 ) sJYM = "6";
	else if(iJYM == 7 ) sJYM = "5";
	else if(iJYM == 8 ) sJYM = "4";
	else if(iJYM == 9) sJYM = "3";
	else if(iJYM == 10) sJYM = "2";

	var cCheck = v_card.charAt(17).toLowerCase();

	if( cCheck != sJYM ){
			alert("非法身份证号码!");//return false; //对不上就是假号码		
		}else{
			alert("输入正确!");
		}	
}

</script>
</head>
<body>

<input type="text" value="" id="card"/>
<input type="button" value="检  查" id="jiancha" onclick="javascript:checkIdCard();"/>
</body>
</html>

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