30行js和30行css實現一個進度條組件,關鍵在於運用css變量
,如何使用css變量;
預覽圖
代碼
Javascript
import React from 'react';
import PropTypes from 'prop-types';
import Styles from './main.module.scss';
/**
*
* 傳入percent,生成進度條
* @param {*} { percent } 進度條進度控制
* @bgColor {*} { percent } 進度條背景顏色
* @returns jsx
*/
export default function ProgressBar({ percent, bgColor }) {
if (percent < 0 || percent > 100) {
console.error(new Error('percent value must between 0 - 100'));
return null;
}
return (
<div
className={Styles.progress}
style={{ '--percent': percent, '--bgColor': bgColor }}
/>
);
}
ProgressBar.propTypes = {
percent: PropTypes.number,
bgColor: PropTypes.string,
};
ProgressBar.defaultProps = {
percent: 50,
bgColor: '#2486ff',
};
CSS
.progress {
width: 100%;
height: 17px;
margin: 5px;
color: #fff;
background-color: #f1f1f1;
font-size: 12px;
}
.progress::before {
counter-reset: percent var(--percent);
/*文字顯示*/
content: counter(percent) "%";
display: inline-block;
/*寬度計算*/
width: calc(100% * var(--percent) / 100);
max-width: 100%;
height: inherit;
text-align: right;
background-color: var(--bgColor);
transition:width 2s;
animation: progress 1s ease forwards;
}
@keyframes progress {
from {
width: 0;
}
to {
width: calc(100% * var(--percent) / 100);
}
}