实现功能：

1、登录时勾选记住密码，用cookie保存账号和密码并对密码进行两次加密处理（纯前端），下次登录自动输入账号密码
2、登录时不勾选，清空cookie，下次登录需要输入

效果图：

=============================================================================================================================================================================================

Html

 <div class="login-form-item">
                  <el-form :model="ValidateForm" ref="ValidateForm" label-width="100px" class="demo-ruleForm">
                      <el-form-item

                              prop="username"
                              :rules="[{  required: true, message: '用户名不能为空'}
                      ]">
                          <span><i class="el-icon-user"></i></span><el-input type="username" v-model.number="ValidateForm.username" autocomplete="off" clearable placeholder="用户名"></el-input>
                      </el-form-item>
                      <br>
                      <el-form-item

                              prop="password"
                              :rules="[{  required: true, message: '密码不能为空'},
                       ]">
                          <span><i class="el-icon-lock"></i></span><el-input type="password" v-model.number="ValidateForm.password" autocomplete="off" clearable show-password placeholder="密码"></el-input>
                      </el-form-item>
                      <br>
                      <el-form-item

                              prop="sidentify"
                              :rules="[
{  required: true, message: '验证码不能为空'},]"
                      >
                          <el-row class="sidentify">
                              <el-col :span="21">
                                  <el-input type="age" v-model="ValidateForm.sidentify" autocomplete="off" placeholder="验证码"></el-input>
                              </el-col>
                              <el-col :span="3" class="sidentify sidentify-img">
                                  <sidentify :changeCode.sync='identifyCode' ref="switchSidentify"></sidentify>
                              </el-col>
                          </el-row>
                      </el-form-item>
                      <el-form-item>
                          <el-checkbox v-model="checked" class="sidentify">记住密码</el-checkbox>
                      </el-form-item>
                      <el-form-item>
                          <el-button type="primary" @click="submitForm('ValidateForm')" class="login-btn">登录</el-button>
                      </el-form-item>
                  </el-form>
              </div>

加密方法我用的base64和CryptoJS 大家记得去下载

js部分：

登录

// 登录
submitForm(formName) { 
    this.$refs[formName].validate((valid) => { 
        if (valid) { 
            let username=this.ValidateForm.username;
            let pwd=this.ValidateForm.password;
            let sidentify=this.ValidateForm.sidentify;
            // 验证码通过
            if (sidentify == this.identifyCode){ 
                this.request.post(this.api.login.logindo,{ username:username,pwd:pwd}).then((res)=>{ 
                    console.log(res);
                    if (res.data.code == 200){ 
                        this.$message({ 
                            message : '登录成功！',
                            type : 'success'
                        })
                        //调用check选中方法
                        this.checkedPwd(username,pwd)
                        this.$router.push({ name:'Home'})
                    }else { 
                        this.$message({ 
                            message : '账号或密码错误，请重新输入！',
                            type : 'error'
                        })
                        //清空
                        this.resetForm('ValidateForm')
                        //刷新验证码
                        this.$refs.switchSidentify.changeCode()
                    }
                })
            }else { 
                this.$message({ 
                    message : '验证码输入错误，请重新输入！',
                    type : 'error'
                })
                this.$refs.switchSidentify.changeCode()
                this.resetForm('ValidateForm')
            }
        } else { 
            return false;
        }
    });
},

check方法：

checkedPwd(username,pwd){ 
    // 记住密码进行cookie存储和密码加密
    if (this.checked){ 
        // base64 加密
        let base64Pwd=Base64.encode(pwd);
        // Encrypt 加密
        let cryptoJsPwd=CryptoJS.AES.encrypt(base64Pwd,key).toString()
        // 账号密码保存天数
        this.setCookie(username,cryptoJsPwd,7)
    }else{ 
        // 清空
        this.clearCookie()
    }
},

设置读取和清空cookie

// 设置cookie
setCookie(c_name, c_pwd, exdays) { 
    var exdate = new Date(); // 获取时间
    exdate.setTime(exdate.getTime() + 24 * 60 * 60 * 1000 * exdays); // 保存的天数
    // 字符串拼接cookie
    window.document.cookie = "username" + "=" + c_name + ";path=/;expires=" + exdate.toGMTString();
    window.document.cookie = "password" + "=" + c_pwd + ";path=/;expires=" + exdate.toGMTString();
},
// 读取cookie
getCookie: function() { 
    if (document.cookie.length > 0) { 
        //checked为true
        this.checked=true
        var arr = document.cookie.split('; ');
        for (var i = 0; i < arr.length; i++) { 
            var arr2 = arr[i].split('=');
            if (arr2[0] == 'username') { 
                this.ValidateForm.username = arr2[1];
            } else if (arr2[0] == 'password') { 
                // Decrypt 解密
                let bytes = CryptoJS.AES.decrypt(arr2[1],key)
                let originalText=bytes.toString(CryptoJS.enc.Utf8)
                // base64解密
                let pwd=Base64.decode(originalText)
                this.ValidateForm.password = pwd;
            }
        }
    }
},
// 清除cookie
clearCookie: function() { 
    this.setCookie("", "", -1); // 修改2值都为空，天数为负1天就好了
},

一定要创建后读取cookie

created () { 
   this.getCookie()
},