', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '' ]; // 四角336×280／300×250系 var squareBannersHtml = [ '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '' ]; // 重複なく2つずつランダム選出 function pickUnique(arr) { var tmp = arr.slice(), out = []; for (var i=0; i<2 && tmp.length>0; i++) { var idx = Math.floor(Math.random()*tmp.length); out.push(tmp.splice(idx,1)[0]); } return out; } var chosenLong = pickUnique(longBannersHtml); var chosenSquare = pickUnique(squareBannersHtml); // 各位置に挿入 & script再実行 function inject(containerId, html) { var c = document.getElementById(containerId); c.innerHTML = html; var old = c.querySelector("script"); var n = document.createElement("script"); n.className = old.className; n.src = old.src; old.parentNode.replaceChild(n, old); } inject("banner-top-left", chosenLong[0]); inject("banner-top-right", chosenLong[1]); inject("banner-bottom-left",chosenSquare[0]); inject("banner-bottom-right",chosenSquare[1]);