工作232：点击tab执行切换

 <el-form  :model="form" label-width="0px">
          <el-form-item>
            <el-input tabindex="1" v-model="form.account" >
              <el-button slot="prepend" icon="el-icon-user"></el-button>
            </el-input>
          </el-form-item>
          <!--登录的密码-->
          <el-form-item>
            <el-input v-model="form.password" tabindex="2"  show-password>
              <el-button slot="prepend" icon="el-icon-lock"></el-button>
            </el-input>
          </el-form-item>

控制点击tab切换