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<!DOCTYPE html>
<html lang="ko">
<head>
    <meta charset="utf-8">
    <style>
        div {
            border: 1px solid #000;
        }
    </style>
    <script src="js/jquery.js"></script>
</head>
<body>
 
    <div>
        <span>0번째</span>
        <p>1번째</p>
        <h3>2번째</h3>
    </div>
 
    <div>
        <button>버튼</button>
    </div>
    <div>
        <button>버튼</button>
    </div>
    <div>
        <button>버튼</button>
    </div>
    <div>
        <button>버튼</button>
    </div>                        
    
    <script>
 
    // 같은 레벨에서 내가 몇번째 요소인지 찾을때는 index를 이용한다.
    // 부모요소를 기준으로 내가 몇번째 자식이냐??
    console.log($("h3").index()); // 2
 
 
    // 그런데 같은 레벨이 아니라 모든 button요소중 내가 몇번째 인지 찾을때에는??
    $("button").click(function(event) {
 
        var i = $(this).index();  
        console.log(i);  // 0번째
 
        // good
        var j = $("button").index(this);  // 존재하는 모든 버튼을 기준으로 index
        console.log(j);
        
    });
 
    </script>
</body>
</html>


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Posted by 힘없는염소