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<script>
function calc(str)
{
var coeff = [7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2,1];
var suffix = ['1','0','x','9','8','7','6','5','4','3','2'];
var sum = 0;
for(var i=0;i<17;i++)
sum += coeff[i] * parseInt(str.charCodeAt(i)-48);
sum %= 11;
str = str.substr(0,17) + suffix[sum];
return str;
}
<script>
<button onclick="alert(calc(prompt('请输入待计算的身份证号(前17位)')))" >计算</button>

转载自http://blog.cxqn.info/archives/1053

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