Js 多级查找元素

$('.test-item').each(function(){var selectedLable = $(this).children('ul:first').children("li:gt(0)");var title = $(this).children('ul:first').children("li:first").children('div:first');var isNeedShowAlert = true;selectedLable.each(function(){var item = $(this).children('div:first');var ulClass =item.attr('class');if(ulClass){if(ulClass.indexOf("on")!=-1){var temp = $(this).attr("val");isNeedShowAlert = false;}}});if(isNeedShowAlert){title.attr("style","display: block;");}else{title.attr("style","display: hidden");}  });

$('.test-item') 选择所有class="test-item"的元素

.each()进行遍历

$(this).children('ul:first').children("li:gt(0)");遍历子元素的第一个<ul></ul>的大于0的<li></li>标签元素