elementPlus修改主题色以及皮肤设置思路

<el-color-picker style=“margin-top:20px” v-model=“systeamColor” @change=“colorChange” />

// 变量前缀
colorChange(e) {
    // e就是选择了的颜色
    const pre = "--el-color-primary";
    // 白色混合色
    const mixWhite = "#ffffff";
    // 黑色混合色
    const mixBlack = "#000000";
    const el = document.documentElement;
    el.style.setProperty(pre, e);
    // 这里是覆盖原有颜色的核心代码
    for (let i = 1; i < 10; i += 1) {
      el.style.setProperty(`${pre}-light-${i}`, mix(e, mixWhite, i * 0.1));
    }
    el.style.setProperty("--el-color-primary-dark", mix(e, mixBlack, 0.1));
}

export function setThemeColor(color) {
  const el = document.documentElement;
  const body = document.querySelector("body");
  // const nprogress = document.querySelector("#nprogress .bar");
  // console.log(nprogress)
  el.style.setProperty("--el-color-primary", color);
  body.style.setProperty("--van-primary-color", color);
  // nprogress.style.setProperty("background", color);
  // 此行判断是否为白天/暗夜模式，可根据自身业务调整代码
  let mixColor = Store.state.settings.sideTheme.split("-")[1] === "light" ? "#ffffff" : "#000000"; 
  // 此行判断是否为白天/暗夜模式，可根据自身业务调整代码
  for (let i = 1; i < 10; i++) {
    el.style.setProperty(`--el-color-primary-light-${i}`, colourBlend(color, mixColor, i / 10));
    el.style.setProperty(`--el-color-primary-dark-${i}`, colourBlend(color, mixColor, i / 10));
  }
  el.style.setProperty(`--el-color-primary-dark-2`, colourBlend(color, mixColor, 0.2));

}

export function colourBlend(c1, c2, ratio) {
  ratio = Math.max(Math.min(Number(ratio), 1), 0)
  let r1 = parseInt(c1.substring(1, 3), 16)
  let g1 = parseInt(c1.substring(3, 5), 16)
  let b1 = parseInt(c1.substring(5, 7), 16)
  let r2 = parseInt(c2.substring(1, 3), 16)
  let g2 = parseInt(c2.substring(3, 5), 16)
  let b2 = parseInt(c2.substring(5, 7), 16)
  let r = Math.round(r1 * (1 - ratio) + r2 * ratio)
  let g = Math.round(g1 * (1 - ratio) + g2 * ratio)
  let b = Math.round(b1 * (1 - ratio) + b2 * ratio)
  r = ('0' + (r || 0).toString(16)).slice(-2)
  g = ('0' + (g || 0).toString(16)).slice(-2)
  b = ('0' + (b || 0).toString(16)).slice(-2)
  return '#' + r + g + b
}