身份证号尾数计算器 – 在线版

<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

  0. 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>