函数:

<script>

function ExtractionBirthday(oneText,twoText)

{

var txtparm = document.getElementById(oneText).value;

if(txtparm.length==18)

{

  var year = txtparm.substring(6,10);

  var month = txtparm.substring(10,12);

  var date=txtparm.substring(12,14);

  document.getElementById(twoText).value=year+"-"+month+"-"+date;

}

else

{

  alert("输入的身份证不正确!");

  document.getElementById(oneText).focus();

  document.getElementById(oneText).value="";

}

}

</script>

实例:

身份证:<input />

出生日期:<input />

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