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P粉0227236062023-08-27 14:04:04
J'ai trouvé la solution. L'erreur était que j'avais rendu la variable 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
disponible pour déterminer la quantité de données qui seraient tracées dans le tableau de données par unité de temps.
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>