添加邮箱登录功能

src/views/login.vue

@@ -6,7 +6,7 @@
         <el-input
           v-model="loginForm.username"
           auto-complete="off"
-          placeholder="账号"
+          placeholder="账号/邮箱"
           type="text"
         >
           <svg-icon slot="prefix" class="el-input__icon input-icon" icon-class="user"/>
@@ -80,7 +80,7 @@ export default {
       },
       loginRules: {
         username: [
-          {required: true, trigger: "blur", message: "请输入您的账号"}
+          {required: true, trigger: "blur", message: "请输入您的账号或邮箱"}
         ],
         password: [
           {required: true, trigger: "blur", message: "请输入您的密码"}