function setScope(obj,setW,setH) { var mainObj = document.getElementById(obj); var subObj = mainObj.getElementsByTagName("img"); for (i=0;i divH) { if (divW > setW) { valW = setW; valH = parseInt(setW * divH / divW); //目标高度 if (valH > setH) { valH = setH; valW = parseInt(setH * valW / valH); //目标宽度 } subObj[i].style.width = valW + "px"; subObj[i].style.height = valH + "px"; subObj[i].style.marginTop = parseInt((setH - valH) / 2) + "px"; } } else if (divH > divW) { if (divH > setH) { valH = setH; valW = parseInt(setH * divW / divH); //目标宽度 if (valW > setW) { valW = setW; valH = parseInt(setW * valH / valW); //目标高度 } subObj[i].style.height = valH + "px"; subObj[i].style.width = valW + "px"; } } else { if (divH < setH) { subObj[i].style.marginTop = parseInt((setH - divH) / 2) + "px"; } else if (divH > setH) { val = setW - setH >= 0?setH:setW; subObj[i].style.width = subObj[i].style.height = val + "px"; if (setH > val) { subObj[i].style.marginTop = parseInt((setH - val) / 2) + "px"; } } } } }