$(function () {     var imgs = $('a>img');     imgs.each(function () {         var img = $(this);         var width = img.attr('width');//区域宽度         var height = img.attr('height');//区域高度         var showWidth = width;//最终显示宽度         var showHeight = height;//最终显示高度         var ratio = width / height;//宽高比         img.load(function () {             var imgWidth, imgHeight, imgratio;             $('<img />').attr('src', img.attr('src')).load(function () {                 imgWidth = this.width;//图片实际宽度                 imgHeight = this.height;//图片实际高度                 imgRatio = imgWidth / imgHeight;//实际宽高比                 if (ratio > imgRatio) {                     showWidth = height * imgRatio;//调整宽度太小                     img.attr('width', showWidth).css('margin-left', (width - showWidth) / 2);                 } else {                     showHeight = width / imgRatio;//调高度太小                     img.attr('height', showHeight).css('margin-top', (height - showHeight) / 2);                 }             });         });     }); });