js异步与解决Promise IE兼容问题

来源：互联网发布：自动曝光控制算法编辑：程序博客网时间：2024/04/30 20:07

function menuType(){menuA = this;var promise = new Promise(function(resolve, reject){wilddog.sync().ref('').orderByKey().once('value', function (snapshot) {    var list = snapshot.val();        $("#leftNav nav").empty();        var html = "";        $.each(list, function (i, n) {        menuA.menuArr.push(i);        menuA.contentArr.push(n.total);            html += "<span class='fenlei' title='" + n.title + "' value="+i+">" + n.title + "</span>";        })        $("#leftNav nav").html(html);          resolve(menuArr);});});return promise;}menuType().then(function(menuArr){// 视频查询全部videoAll();});

async function videoAll() {// 专家推荐视频-------------------------------start$("#expert").empty();wilddog.sync().ref('').orderByChild('update_time').limitToLast(homepagesize).on("child_added", function (recommenddata) {    let n = recommenddata.val();    let i = recommenddata.key();        var rechtml = "";        rechtml += '<div class="flex-box" clickhref="'+ i + '" value="' + i + '"><span class="preview-box"><i class="icon icon-video-play"></i><img src="http://' + n.thumbnail + '" /></span>'+        '<h4 class="video-title">' + n.description + '</h4>'+        '<span class="corner">会员免费</span><span class="look">'+        '<i class="icon icon-eye"></i>'+ n.clickamount + '人学过</span></div>';        $("#expert").prepend(rechtml);});// 专家推荐视频--------------------------------end// 普通视频------------------------------------startvar menulength = menuArr.length;$(".djt").empty();for (var j=0; j<menulength; j++){// 找到分类节点名称mtype = menuArr[j];var cnum = await countnum(mtype); // 普通视频获取details(mtype,cnum)}}

IE不支持 Promise 解决办法（可搜索 polyfill）：引入 <script src = "https://cdn.polyfill.io/v2/polyfill.min.js"></script>

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