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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/API/HTMLProgressElement/max below:

HTMLProgressElement：max 属性 - Web API

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HTMLProgressElement 接口的 max 属性表示 <progress> 元素的范围的上限。

一个大于零的浮点数。默认值是 1.0。

进度：<progress id="pBar"></progress> <span>0</span>%

const pBar = document.getElementById("pBar");
const span = document.getElementsByTagName("span")[0];

console.log(`max 的默认值：${pBar.max}`);

pBar.max = 100;
pBar.value = 0;

setInterval(() => {
  pBar.value = pBar.value < pBar.max ? pBar.value + 1 : 0;

  span.textContent = Math.trunc(pBar.position * 100);
}, 100);

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