$('.showImg').click(function(){	var src = $(this).prevAll('input').val();	layer.open({		content:'',	});	$("").attr("src", src).load(function() {//imgSrc是图片地址		var realWidth = this.width;//图片宽		var realHeight = this.height;//图片高					$imgw = realWidth;		var w_w = $(window).width(); 		var w_h = $(window).height(); 		var go_l = (w_w - realWidth)/2;		var go_t = (w_h - realHeight)/2-70;				if($imgw >= w_w){//当图片宽大于窗口宽时			$imgw = w_w;			go_l = 0;			$('.content_img').css('width',w_w-40);		}				$('.layui-layer-dialog').width($imgw).css({			'left':go_l,			'top':go_t		});	})	});