js响应式加载进度条动画特效

使用方法

let bar = document.querySelector("#loading-bar");
let progress = document.querySelector("#progress");
let reporter = document.querySelector("p > span");

let processingTime = 800;
let i = 0;
setInterval(function () {

  if (i < 99) {
    i = i + Math.floor(Math.random() * (25 - 1));
    progress.style.width = i + "%";
    processingTime = Math.floor(Math.random() * (3000 - 800));
    if (i >= 99) {
      i = 99;
      reporter.textContent = i;
      bar.classList.add('complete');
      processingTime = 1000;
    }
    reporter.textContent = i;
  } else {
    i = 0;
    progress.style.width = i + "%";
    reporter.textContent = i;
    bar.classList.remove('complete');
    processingTime = Math.floor(Math.random() * (3000 - 800));
  };

}, processingTime);