效果如果所示：

image.png

思路：勾选记住密码框，点击登录，账号密码勾选状态保存到cookie,下次登录将账号密码勾选状态从cookie中取出；不勾选时，点击登录清空保存到cookie的值

代码如下：

HTML部分

<template>
  <div class="login">
        <div class="right">
          <div class="title">账号密码登录</div>
          <div class="welcome">
            <div class="wleft">
              <hr style="border: none;border-top:0.005rem solid #666;margin-top:0.09rem" />
            </div>
            <div class="center">welcome</div>
            <div class="wright">
              <hr style="border: none;border-top:0.005rem solid #666;margin-top:0.09rem" />
            </div>
          </div>
          <div class="username">
            <div class="usernameImg"></div>
            <div class="usernameText">
              <input type="text" placeholder="请输入账号" v-model="username" />
            </div>
          </div>
          <div class="password">
            <div class="passwordImg" >
              <img src="../assets/img/password.png" alt />
            </div>
            <div class="passwordText">
              <input placeholder="请输入密码" v-model="password" />
            </div>
          </div>
          <div class="rememberpassword">
            <input type="checkbox" v-model="checked" />
            <span>记住密码</span>
          </div>
          <div class="register" @click="loadData">登录</div>
        </div>
  </div>
</template>

JS部分

  data() {
    return {
      username: "",
      password: "",
      checked:false
    };
  },
  mounted() {
    this.getCookie();
  },
methods: {
    // 登录
    loadData() {
          if (Boolean(this.checked) == true) {
            console.log(this.checked);
            // 将账号密码勾选状态存入cookie中，并设置储存天数
            this.setCookie(this.username, this.password,this.checked, 7);
          } else {
            //  清除cookie值
            this.clearCookie();
          }
    },
    //设置cookie
    setCookie(c_name, c_pwd,c_che, 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 =
        "userPwd" + "=" + c_pwd + ";path=/;expires=" + exdate.toGMTString();

         window.document.cookie =
        "userChe" + "=" + c_che+ ";path=/;expires=" + exdate.toGMTString();
    },

    //读取cookie
    getCookie: function () {
      if (document.cookie.length > 0) {
        var arr = document.cookie.split("; "); //这里显示的格式需要切割一下自己可输出看下
        for (var i = 0; i < arr.length; i++) {
          var arr2 = arr[i].split("="); //再次切割
          //判断查找相对应的值
          console.log(arr2);
          if (arr2[0] == "userName") {
            this.username = arr2[1]; //保存到保存数据的地方
          } else if (arr2[0] == "userPwd") {
            this.password = arr2[1];
          }else if(arr2[0]=="userChe") {
            if(arr2[1]==-1){
              this.checked=false
            }else {
              this.checked=arr2[1];
            }
          }
        }
      }
    },
    //清除cookie
    clearCookie: function () {
      this.setCookie("", "","", -1); //修改2值都为空，天数为-1就好了
    },
  },