一、效果图

二、方法

改变elementUI 的主要色 --el-color-primary 为自己选择的颜色，核心代码如下：

// 处理主题样式
export function handleThemeStyle(theme) {document.documentElement.style.setProperty('--el-color-primary', theme)
}

三、全部代码

// 处理主题样式
export function handleThemeStyle(theme) {document.documentElement.style.setProperty('--el-color-primary', theme)for (let i = 1; i <= 9; i++) {document.documentElement.style.setProperty(`--el-color-primary-light-${i}`, `${getLightColor(theme, i / 10)}`)}for (let i = 1; i <= 9; i++) {document.documentElement.style.setProperty(`--el-color-primary-dark-${i}`, `${getDarkColor(theme, i / 10)}`)}
}// hex颜色转rgb颜色
export function hexToRgb(str) {str = str.replace('#', '')let hexs = str.match(/../g)for (let i = 0; i < 3; i++) {hexs[i] = parseInt(hexs[i], 16)}return hexs
}// rgb颜色转Hex颜色
export function rgbToHex(r, g, b) {let hexs = [r.toString(16), g.toString(16), b.toString(16)]for (let i = 0; i < 3; i++) {if (hexs[i].length == 1) {hexs[i] = `0${hexs[i]}`}}return `#${hexs.join('')}`
}// 变浅颜色值
export function getLightColor(color, level) {let rgb = hexToRgb(color)for (let i = 0; i < 3; i++) {rgb[i] = Math.floor((255 - rgb[i]) * level + rgb[i])}return rgbToHex(rgb[0], rgb[1], rgb[2])
}// 变深颜色值
export function getDarkColor(color, level) {let rgb = hexToRgb(color)for (let i = 0; i < 3; i++) {rgb[i] = Math.floor(rgb[i] * (1 - level))}return rgbToHex(rgb[0], rgb[1], rgb[2])
}