JS返回頁(yè)面時(shí)自動(dòng)回滾到歷史瀏覽位置

<div class="weui-tab cache" name="index">
 ....
</div>

var cache;
var cacheId = $(".cache").attr("name");

window.onload = function () {
 //載入緩存的列表
 loadCache(cacheId);
}

window.onunload = function () {
 //可以通過(guò)needCache這個(gè)flag來(lái)控制是否需要緩存
 if (localStorage.needCache == 'true') {
 //離開頁(yè)面時(shí)生成緩存
 createCache(cacheId);
 }
}

/* *
 * @brief 可對(duì)指定多個(gè)控件進(jìn)行內(nèi)容和位置的緩存
 * @param cacheId 緩存元素的id
 * @return null
 * */
function createCache(cacheId) {
 //對(duì)內(nèi)容進(jìn)行緩存
 var list = [];
 var listController = $('.cache');
 $.each(listController, function (index, value, array) {
 list.push(value.innerHTML);
 })
 //對(duì)瀏覽到的位置進(jìn)行緩存
 var top = [];
 var topController = $(".cache").find(".top");
 $.each(topController, function (index, value, array) {
 top.push(value.scrollTop);
 })
 //存入sessionstorage中
 sessionStorage.setItem(cacheId, JSON.stringify({
 list: list,
 top: top
 }));
}

/* *
 * @breif 可對(duì)指定多個(gè)控件加載緩存
 * @param 加載緩存的id
 * @return null
 * */
function loadCache(cacheId) {
 //一定要放在整個(gè)js文件最前面
 cache = sessionStorage.getItem(cacheId);
 if (cache) {
 cache = JSON.parse(cache);
 //還原內(nèi)容
 var listController = $('.cache');
 $.each(listController, function (index, value, array) {
 value.innerHTML = cache.list[index];
 })
 //還原位置
 var topController = $(".cache").find(".top");
 $.each(topController, function (index, value, array) {
 value.scrollTop = cache.top[index];
 })
 }
}