antd-mobile/2x/es/utils/measure-css-length.js

<img src="https://gw.alipayobjects.com/mdn/rms_ee68a8/afts/img/A*hjjDS5Yy-ooAAAAAAAAAAAAAARQnAQ" alt="logo" width="100%" />

import { isDev } from './is-dev';
import { devError } from './dev-log';
export function measureCSSLength(raw) {
  const withUnit = raw.trim();

  if (withUnit.endsWith('px')) {
    return parseFloat(withUnit);
  } else if (withUnit.endsWith('rem')) {
    return parseFloat(withUnit) * parseFloat(window.getComputedStyle(document.documentElement).fontSize);
  } else if (withUnit.endsWith('vw')) {
    return parseFloat(withUnit) * window.innerWidth / 100;
  } else {
    if (isDev) {
      devError('Global', 'You are using a not supported CSS unit. Only `px` `rem` and `vw` are supported.');
    }

    return 0;
  }
}