$(function () {$('ul li').addClass(function (i) { return i % 6 == 5 ? "ab" : ""; });  // 隔6行 加空白。或者加虛線$('.imglist li').after(function (i) {var css = "";if (i % 3 == 2) {css = "<div class='dashed clear' ></div>";}return css;}); //圖片列表photo.html 隔3行 虛線});

//方法一：  jQuery(document).ready(function () {    var NewUL = jQuery(".photo_list ul li");    for (var i = 0; i < NewUL.length; i++) {      if ((i + 1) % 3 == 0) {        NewUL.eq(i).after("<li class=/"photo_space/"></li>");      }    }    $(".photo_list li:last").css("border-bottom", "none");  })

.ab{　　height:80px;}.dashed{border-bottom:1px dashed #b9c3c7;padding-bottom:10px;margin-bottom:10px}.clear{clear:both}.imglist ul li {text-align:center;line-height:25px;float:left}