jQuery(function() { setSize(); //リサイズしたら実行 jQuery(window).resize(function(){ setSize(); }); }); function setSize() { //画像サイズ指定 var imgW = 512; var imgH = 341; //ウィンドウサイズ取得 var winW =jQuery(window).width(); var winH = jQuery(window).height(); var scaleW = winW / imgW; var scaleH = winH / imgH; var fixScale = Math.max(scaleW, scaleH); var setW = imgW * fixScale; var setH = imgH * fixScale; var moveX = Math.floor((winW - setW) / 2); var moveY = Math.floor((winH - setH) / 2); jQuery('#bg').css({ 'width': setW, 'height': setH, 'left' : moveX, 'top' : moveY }); }
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