vue项目中引入element-ui时，如何更改主题色

vue项目中引入element-ui时，如何更改主题色
https://www.cnblogs.com/yuwenjing0727/p/9450492.html

在我们做项目时，我们经常会遇到切换主题色的功能，下面我们就来说一下通过颜色选择器我们就能改变项目的主题颜色

代码如下：

颜色选择器所在组件：

top-theme.vue内容如下：

其中mixins下的theme.js如下：

内容为：

/*
 *    Copyright (c) 2018-2025, lengleng All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * Neither the name of the pig4cloud.com developer nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * Author: lengleng ([email protected])
 */

import {
  mapGetters
} from "vuex";
const version = require("element-ui/package.json").version; // element-ui version from node_modules
const ORIGINAL_THEME = "#409EFF"; // default color
export default function () {
  return {
    data() {
      return {
        themeVal: ORIGINAL_THEME
      }
    },
    created() {
      this.themeVal = this.theme;
    },
    watch: {
      themeVal(val, oldVal) {
        this.$store.commit("SET_THEME", val);
        this.updateTheme(val, oldVal);
      }
    },
    computed: {
      ...mapGetters(["theme"])
    },
    methods: {
      updateTheme(val, oldVal) {
        if (typeof val !== "string") return;
        const head = document.getElementsByTagName("head")[0];
        const themeCluster = this.getThemeCluster(val.replace("#", ""));
        const originalCluster = this.getThemeCluster(oldVal.replace("#", ""));
        const getHandler = (variable, id) => {
          return () => {
            const originalCluster = this.getThemeCluster(
              ORIGINAL_THEME.replace("#", "")
            );
            const newStyle = this.updateStyle(
              this[variable],
              originalCluster,
              themeCluster
            );

            let styleTag = document.getElementById(id);
            if (!styleTag) {
              styleTag = document.createElement("style");
              styleTag.setAttribute("id", id);
              head.appendChild(styleTag);
            }
            styleTag.innerText = newStyle;
          };
        };

        const chalkHandler = getHandler("chalk", "chalk-style");

        if (!this.chalk) {
          const url = `https://unpkg.com/element-ui@${version}/lib/theme-chalk/index.css`;
          this.getCSSString(url, chalkHandler, "chalk");
        } else {
          chalkHandler();
        }

        const link = [].slice.call(
          document.getElementsByTagName("head")[0].getElementsByTagName("link")
        );
        for (let i = link.length - 3; i < link.length; i++) {
          const style = link[i];
          this.getCSSString(style.href, innerText => {
            const originalCluster = this.getThemeCluster(
              ORIGINAL_THEME.replace("#", "")
            );
            const newStyle = this.updateStyle(
              innerText,
              originalCluster,
              themeCluster
            );
            let styleTag = document.getElementById(i);
            if (!styleTag) {
              styleTag = document.createElement("style");
              styleTag.id = i;
              styleTag.innerText = newStyle;
              head.appendChild(styleTag);
            }
          });
        }

        const styles = [].slice
          .call(document.querySelectorAll("style"))
          .filter(style => {
            const text = style.innerText;
            return (
              new RegExp(oldVal, "i").test(text) && !/Chalk Variables/.test(text)
            );
          });
        styles.forEach(style => {
          const {
            innerText
          } = style;
          if (typeof innerText !== "string") return;
          style.innerText = this.updateStyle(
            innerText,
            originalCluster,
            themeCluster
          );
        });
      },
      updateStyle(style, oldCluster, newCluster) {
        let newStyle = style;
        oldCluster.forEach((color, index) => {
          newStyle = newStyle.replace(new RegExp(color, "ig"), newCluster[index]);
        });
        return newStyle;
      },
      getCSSString(url, callback, variable) {
        const xhr = new XMLHttpRequest();
        xhr.onreadystatechange = () => {
          if (xhr.readyState === 4 && xhr.status === 200) {
            if (variable) {
              this[variable] = xhr.responseText.replace(/@font-face{[^}]+}/, "");
            }
            callback(xhr.responseText);
          }
        };
        xhr.open("GET", url);
        xhr.send();
      },
      getThemeCluster(theme) {
        const tintColor = (color, tint) => {
          let red = parseInt(color.slice(0, 2), 16);
          let green = parseInt(color.slice(2, 4), 16);
          let blue = parseInt(color.slice(4, 6), 16);

          if (tint === 0) {
            // when primary color is in its rgb space
            return [red, green, blue].join(",");
          } else {
            red += Math.round(tint * (255 - red));
            green += Math.round(tint * (255 - green));
            blue += Math.round(tint * (255 - blue));

            red = red.toString(16);
            green = green.toString(16);
            blue = blue.toString(16);

            return `#${red}${green}${blue}`;
          }
        };

        const shadeColor = (color, shade) => {
          let red = parseInt(color.slice(0, 2), 16);
          let green = parseInt(color.slice(2, 4), 16);
          let blue = parseInt(color.slice(4, 6), 16);

          red = Math.round((1 - shade) * red);
          green = Math.round((1 - shade) * green);
          blue = Math.round((1 - shade) * blue);

          red = red.toString(16);
          green = green.toString(16);
          blue = blue.toString(16);

          return `#${red}${green}${blue}`;
        };

        const clusters = [theme];
        for (let i = 0; i <= 9; i++) {
          clusters.push(tintColor(theme, Number((i / 10).toFixed(2))));
        }
        clusters.push(shadeColor(theme, 0.1));
        return clusters;
      }
    }
  }
}

涉及到的vuex相关模块为：

其中validate.js中有一系列正则校验的相关代码：

/*
 *    Copyright (c) 2018-2025, lengleng All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * Neither the name of the pig4cloud.com developer nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * Author: lengleng ([email protected])
 */

/**
 * Created by jiachenpan on 16/11/18.
 */

export function isvalidUsername(str) {
    const valid_map = ['admin', 'editor']
    return valid_map.indexOf(str.trim()) >= 0
}

/* 合法uri*/
export function validateURL(textval) {
    const urlregex = /^(https?|ftp):\/\/([a-zA-Z0-9.-]+(:[a-zA-Z0-9.&%$-]+)*@)*((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]?)(\.(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])){3}|([a-zA-Z0-9-]+\.)*[a-zA-Z0-9-]+\.(com|edu|gov|int|mil|net|org|biz|arpa|info|name|pro|aero|coop|museum|[a-zA-Z]{2}))(:[0-9]+)*(\/($|[a-zA-Z0-9.,?'\\+&%$#=~_-]+))*$/
    return urlregex.test(textval)
}

/* 小写字母*/
export function validateLowerCase(str) {
    const reg = /^[a-z]+$/
    return reg.test(str)
}

/* 大写字母*/
export function validateUpperCase(str) {
    const reg = /^[A-Z]+$/
    return reg.test(str)
}

/* 大小写字母*/
export function validatAlphabets(str) {
    const reg = /^[A-Za-z]+$/
    return reg.test(str)
}
/*验证pad还是pc*/
export const vaildatePc = function () {
    const userAgentInfo = navigator.userAgent;
    const Agents = ["Android", "iPhone",
        "SymbianOS", "Windows Phone",
        "iPad", "iPod"];
    let flag = true;
    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) {
            flag = false;
            break;
        }
    }
    return flag;
}
/**
 * validate email
 * @param email
 * @returns {boolean}
 */
export function validateEmail(email) {
    const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/
    return re.test(email)
}

/**
 * 判断身份证号码
 */
export function cardid(code) {
    let list = [];
    let result = true;
    let msg = '';
    var city = {
        11: "北京",
        12: "天津",
        13: "河北",
        14: "山西",
        15: "内蒙古",
        21: "辽宁",
        22: "吉林",
        23: "黑龙江 ",
        31: "上海",
        32: "江苏",
        33: "浙江",
        34: "安徽",
        35: "福建",
        36: "江西",
        37: "山东",
        41: "河南",
        42: "湖北 ",
        43: "湖南",
        44: "广东",
        45: "广西",
        46: "海南",
        50: "重庆",
        51: "四川",
        52: "贵州",
        53: "云南",
        54: "西藏 ",
        61: "陕西",
        62: "甘肃",
        63: "青海",
        64: "宁夏",
        65: "新疆",
        71: "台湾",
        81: "香港",
        82: "澳门",
        91: "国外 "
    };
    if (!validatenull(code)) {
        if (code.length == 18) {
            if (!code || !/(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(code)) {
                msg = "证件号码格式错误";
            } else if (!city[code.substr(0, 2)]) {
                msg = "地址编码错误";
            } else {
                //18位身份证需要验证最后一位校验位
                code = code.split('');
                //∑(ai×Wi)(mod 11)
                //加权因子
                var factor = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];
                //校验位
                var parity = [1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2, 'x'];
                var sum = 0;
                var ai = 0;
                var wi = 0;
                for (var i = 0; i < 17; i++) {
                    ai = code[i];
                    wi = factor[i];
                    sum += ai * wi;
                }
                var last = parity[sum % 11];
                if (parity[sum % 11] != code[17]) {
                    msg = "证件号码校验位错误";
                } else {
                    result = false;
                }

            }
        } else {
            msg = "证件号码长度不为18位";
        }

    } else {
        msg = "证件号码不能为空";
    }
    list.push(result);
    list.push(msg);
    return list;
}
/**
 * 判断手机号码是否正确
 */
export function isvalidatemobile(phone) {
    let list = [];
    let result = true;
    let msg = '';
    var isPhone = /^0\d{2,3}-?\d{7,8}$/;
    //增加134 减少|1349[0-9]{7}，增加181,增加145，增加17[678]
    var isMob = /^((\+?86)|(\(\+86\)))?(13[0123456789][0-9]{8}|15[012356789][0-9]{8}|18[012356789][0-9]{8}|14[57][0-9]{8}|17[3678][0-9]{8})$/;
    if (!validatenull(phone)) {
        if (phone.length == 11) {
            if (isPhone.test(phone)) {
                msg = '手机号码格式不正确';
            } else {
                result = false;
            }
        } else {
            msg = '手机号码长度不为11位';
        }
    } else {
        msg = '手机号码不能为空';
    }
    list.push(result);
    list.push(msg);
    return list;
}
/**
 * 判断姓名是否正确
 */
export function validatename(name) {
    var regName = /^[\u4e00-\u9fa5]{2,4}$/;
    if (!regName.test(name)) return false;
    return true;
};
/**
 * 判断是否为整数
 */
export function validatenum(num, type) {
    let regName = /[^\d.]/g;
    if (type == 1) {
        if (!regName.test(num)) return false;
    } else if (type == 2) {
        regName = /[^\d]/g;
        if (!regName.test(num)) return false;
    }
    return true;
};
/**
 * 判断是否为小数
 */
export function validatenumord(num, type) {
    let regName = /[^\d.]/g;
    if (type == 1) {
        if (!regName.test(num)) return false;
    } else if (type == 2) {
        regName = /[^\d.]/g;
        if (!regName.test(num)) return false;
    }
    return true;
};
/**
 * 判断是否为空
 */
export function validatenull(val) {
    if (val instanceof Array) {
        if (val.length == 0) return true;
    } else if (val instanceof Object) {
        if (JSON.stringify(val) === '{}') return true;
    } else {
        if (val == 'null' || val == null || val == 'undefined' || val == undefined || val == '') return true;
        return false;
    }
    return false;

};

utils下store.js内容如下：

/*
 *    Copyright (c) 2018-2025, lengleng All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * Neither the name of the pig4cloud.com developer nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * Author: lengleng ([email protected])
 */

import { validatenull } from '@/utils/validate'
/**
 * 存储localStorage
 */
export const setStore = (params) => {
  const {
    name,
    content,
    type,
    datetime
  } = params
  const obj = {
    dataType: typeof (content),
    content: content,
    type: type,
    datetime: new Date().getTime()
  }
  if (type) window.sessionStorage.setItem(name, JSON.stringify(obj))
  else window.localStorage.setItem(name, JSON.stringify(obj))
}
/**
 * 获取localStorage
 */
export const getStore = (params) => {
  const {
    name,
    type
  } = params
  let obj = {}
  let content
  obj = window.localStorage.getItem(name)
  if (validatenull(obj)) obj = window.sessionStorage.getItem(name)
  if (validatenull(obj)) return
  obj = JSON.parse(obj)
  if (obj.dataType === 'string') {
    content = obj.content
  } else if (obj.dataType === 'number') {
    content = Number(obj.content)
  } else if (obj.dataType === 'boolean') {
    content = eval(obj.content)
  } else if (obj.dataType === 'object') {
    content = obj.content
  }
  return content
}
/**
 * 删除localStorage
 */
export const removeStore = params => {
  let {
    name
  } = params
  window.localStorage.removeItem(name)
  window.sessionStorage.removeItem(name)
}

store文件夹下index.js内容如下：

/**
 * Created by xieli on 2018/8/7 0007.
 */
import Vue from 'vue'
import Vuex from 'vuex'
import common from './modules/common'
import getters from './getters'

Vue.use(Vuex)
const store = new Vuex.Store({
    modules: {
        common,
    },
    getters,
})

export default store

modules文件夹下common.js内容如下：

/*
 *    Copyright (c) 2018-2025, lengleng All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * Neither the name of the pig4cloud.com developer nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * Author: lengleng ([email protected])
 */

import {
    setStore,
    getStore,
    removeStore
} from '@/utils/store'
import {
    validatenull
} from '@/utils/validate'


const common = {

  state: {
    theme: getStore({
      name: 'theme'
    }) || '#409EFF',
      bg:"主题颜色"
  },
  mutations: {
      SET_THEME: (state, color) => {
      state.theme = color
      setStore({
        name: 'theme',
        content: state.theme
      })
    },

  }
}
export default common

store文件夹下getters.js内容如下：

   /*
 *    Copyright (c) 2018-2025, lengleng All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * Neither the name of the pig4cloud.com developer nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * Author: lengleng ([email protected])
 */

const getters = {
  theme: state => state.common.theme,
    /*bg:    state => state.common.bg,*/

}
export default getters

其中核心文件为mixins下的theme.js

项目地址：

https://github.com/yuwenjing0727/electric-ui.git