js闭包讲解

<div class="con12"><div class="left"><ul id="liu"><li class="chang02">长双歧杆菌</li><li class="chang01">短双歧杆菌</li><li class="chang01">乳双歧杆菌</li><li class="chang01">嗜酸乳杆菌</li><li class="chang01">罗伊氏乳杆菌</li><li class="chang01">鼠李糖乳杆菌</li></ul></div><div class="right"><div class="show"><div class="title"><span class="one">长双歧杆菌</span>  <span class="two">Bifidobacterium longum</span>  <span class="three">11.5亿 CFU/小袋</span></div><div class="des">可降低肠道 pH，抑制致病菌的生长繁殖，达到调节肠道菌群失调和改善肠道微环境的效果<span class="biao">[7]</span>。</div><div class="desimg"><img src="img/des01.jpg"></div></div><div class="show none"><div class="title"><span class="one">短双歧杆菌</span>  <span class="two">Bifidobacterium breve</span>  <span class="three">11亿 CFU/小袋</span></div><div class="des">拥有较强的抗酸能力与粘附力，黏附在肠道细胞膜上，能有效阻止致病菌的入侵，给宝宝一个健康的肠道<span class="biao">[8,9]</span>。</div><div class="desimg"><img src="img/duansuangqi.jpg"></div></div><div class="show none"><div class="title"><span class="one">乳酸双歧杆菌</span>  <span class="two">Bifidobacterium lactis</span>  <span class="three">12亿 CFU/小袋</span></div><div class="des">乳双歧杆菌能增强宝宝的细胞免疫和体液免疫功能，提高宝宝的免疫力，让宝宝少生病<span class="biao">[10]</span>。</div><div class="desimg"><img src="img/rusuangqi.jpg"></div></div><div class="show none"><div class="title"><span class="one">鼠李糖乳杆菌</span>  <span class="two">Lactobacillus rhamnosus</span>  <span class="three">6.5亿 CFU/小袋</span></div><div class="des">参与宝宝消化道内菌群调节, 排除宝宝体内毒素，维持宝宝肠道健康<span class="biao">[11]</span>。</div><div class="desimg"><img src="img/shulitang.jpg"></div></div><div class="show none"><div class="title"><span class="one">罗伊氏乳杆菌</span>  <span class="two">Lactobacillus reuteri</span>  <span class="three">1亿 CFU/小袋</span></div><div class="des">增加肠道固水物质——短链脂肪酸的含量,软化大便，并且有很强的粘附能力，对改善肠道黏膜免疫功能，提高宝宝免疫力具有积极的作用<span class="biao">[12]</span>。</div><div class="desimg"><img src="img/luoyishi.jpg"></div></div><div class="show none"><div class="title"><span class="one">嗜酸乳杆菌</span>  <span class="two">Lactobacillus acidophilus</span>  <span class="three">8亿 CFU/小袋</span></div><div class="des">发酵后形成乳酸，帮助宝宝消化肠胃内的食物，提高钙、磷、铁的利用率，并且对其他乳杆菌和双歧杆菌在肠道的增殖具有积极作用<span class="biao">[13,14]</span>。</div><div class="desimg"><img src="img/sishuanru.jpg"></div></div></div></div>

window.onload=function(){var one = document.getElementById(‘liu‘);var oPoint = one.getElementsByTagName(‘li‘);var div = document.getElementsByClassName(‘show‘);var lilen = oPoint.length;for (var i = 0; i < lilen; i++) {oPoint[i].index = i;oPoint[i].onmouseover = function (){for (var j = 0; j <lilen; j++) {oPoint[j].className = "chang01";div[j].className += " none"; ???????????} ???????????oPoint[this.index].className = "chang02"; ???????????div[this.index].className = "show";}}}