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document.getElementByTagName()¸¦ jQuery·Î ¹Ù²ãº¸ÀÚ.
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// dom »ç¿ë
window.onload=function()
    {
    var divs =window.document.getElementsByTagName("div");
        console.log(divs);
        for(var i=0;i < divs.length;i++)
        {
            var div         = divs.item(i);
            console.log("i ", i, div);
        }   }
// jQuery »ç¿ë
$(document).ready(function()
    {
    
        var $divs =$("div");
        console.log($divs);
        
        //for(var i=0;i<$divs.length;i++)
        //{
        //  var $div        = $divs.eq(i);
        //  
        //
        //  console.log("1 ", i,$div);  
        //  console.log("2", $div[0]);
        //  console.log("3", $divs.get(i));
        //  console.log("4", $div.get(0));          
        //}
        
        $divs.each(function(index, target){
            console.log("this =  ", this);
            console.log("$(this) = ",$(this));
            console.log("target = ",target);
            console.log($divs[index]);
        });
    });
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