Heim > Fragen und Antworten > Hauptteil
P粉0227236062023-08-27 14:04:04
我已经找到解决办法了。错误是我将 async
一词放在 res.forEach
中。当我将其放在 fetch.then
之后并使用 for
循环而不是 forEach
时,函数执行的行为发生了变化并且可以成功完成。 loadNumber
变量可用于确定每单位时间将在数据表中绘制多少数据。
let handleProgressBar = (id, value, total) => { let percent = Math.round((value / total) * 10000) / 100; $(id + " > div").html(percent + "%"); $(id + " > div").css('width', percent + "%"); } let table = $('#data').DataTable({ dom: 'ilpftr' }); fetch('https://jsonplaceholder.typicode.com/photos') .then((res) => res.json()) .then(async(res) => { let loadNumber = 50; for(let i = 0; i < res.length; i++) { table.row.add([ res[i].id, res[i].albumId, res[i].title, res[i].url ]); if (i % loadNumber == 0) { table.draw(); handleProgressBar('#progress-bar', i+1, res.length); await new Promise(r => setTimeout(r, 1)); // sleep 1 ms } } table.draw(); handleProgressBar('#progress-bar', res.length, res.length); });
.progress-bar-striped { overflow: hidden; height: 20px; margin-bottom: 20px; background-color: #f5f5f5; border-radius: 4px; -webkit-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1); -moz-box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1); box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1); } .progress-bar-striped>div { background-image: linear-gradient(45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent); background-size: 40px 40px; float: left; width: 0%; height: 100%; font-size: 12px; line-height: 20px; color: #000000; font-weight: bold; text-align: center; -webkit-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15); -moz-box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15); box-shadow: inset 0 -1px 0 rgba(0, 0, 0, 0.15); /*-webkit-transition: width 3s ease; -moz-transition: width 3s ease; -o-transition: width 3s ease; transition: width 3s ease;*/ animation: progress-bar-stripes 2s linear infinite; background-color: #288ade; } .progress-bar-striped p { margin: 0; } @keyframes progress-bar-stripes { 0% { background-position: 40px 0; } 100% { background-position: 0 0; } }
<link href="https://cdn.datatables.net/1.13.4/css/jquery.dataTables.min.css" rel="stylesheet"/> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdn.datatables.net/1.13.4/js/jquery.dataTables.min.js"></script> <div id="progress-bar" class="progress-bar-striped"> <div style="width: 0%;"> <p>0%</p> </div> </div> <table id="data" class="table display table-stripped"> <thead> <tr> <th>ID</th> <th>Album ID</th> <th>Title</th> <th>URL Photo</th> </tr> </thead> <tbody></tbody> </table>