jQuery
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="UTF-8">
<div class="target">
<input value="1">
<input name="shain_name" value="ABCDEFG">
<input value="2">
<input value="8888" class="pKisu" >
</div>
<script src="jquery-3.6.0.min.js"></script>
<script>
$(function(){
//////////////↓ここの部分///////////////////////////
result_01 = $('.target').find('input[name=shain_name]').val();
result_02 = $('.pKisu').val();
//////////////↑ここの部分///////////////////////////
console.log(result_01);
console.log(result_02);
});
</script>
出力結果
ABCDEFG
8888