• 今天遇到这么一个需求： 后端返回了一个按钮数据的list，数据格式如下,但是设计图给的样式是背景色有透明度显示的，所以这边将十六进制的颜色转换成rgba形式

let data = [
      { btnId: 1, name: '按钮1', color: "#3f6da7" },
      { btnId: 2, name: '按钮2', color: "#5ada7" },
      { btnId: 3, name: '按钮3', color: "#ef6d47" },
      { btnId: 4, name: '按钮4', color: "#a7a7a7" },
]

demo示例

import React from 'react'
class Test extends React.Component {
  constructor(props) {
    super(props)
    this.state = {}
  }
  hexToRgba = (hex, opacity) => {
    return 'rgba(' + parseInt('0x' + hex.slice(1, 3)) + ',' + parseInt('0x' + hex.slice(3, 5)) + ','
      + parseInt('0x' + hex.slice(5, 7)) + ',' + opacity + ')';
  }
  render() {
    const color = "#a0c3d8"
    const styles = {
      width: '200px',
      height: '300px',
    }
    let data = [
      { btnId: 1, name: '按钮1', color: "#3f6da7" },
      { btnId: 2, name: '按钮2', color: "#5ada7" },
      { btnId: 3, name: '按钮3', color: "#ef6d47" },
      { btnId: 4, name: '按钮4', color: "#a7a7a7" },
    ]
    const btnItem = {
      height: "40px",
      lineHeight:'40px',
      borderRadius: "20px",
      padding: '0 15px',
      marginBottom: "20px"
    }
    return (
      <div style={{ background: this.hexToRgba(color, 0.05), ...styles }}>
        {data.map(item => <div className="btnItem" style={{ background: this.hexToRgba(item.color, 0.1), ...btnItem }}>{item.name}</div>)}
      </div>
    )
  }
}
export default Test

核心转换代码

hexToRgba = (hex, opacity) => {
    return 'rgba(' + parseInt('0x' + hex.slice(1, 3)) + ',' + parseInt('0x' + hex.slice(3, 5)) + ','
      + parseInt('0x' + hex.slice(5, 7)) + ',' + opacity + ')';
}
```