<script>
function calc(str)
{
/*
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2004 Sam Hocevar <sam@hocevar.net>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
You just DO WHAT THE FUCK YOU WANT TO.
*/
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>
