vue input组件如何设置失焦与聚焦

<Input ref="input" v-model="inputData" @on-blur="inputChange" placeholder="请输入..."/>

this.$refs.input.focus();      // 聚焦
 
this.inputData = '111';  // 给输入框赋值
 
this.$refs.input.blur();   // 失焦

this.$refs.input.focus({
    cursor: 'start'    // 聚焦在文本的开始位置
});

**html**
 <el-form
      ref="form"
      :model="form"
    >
      <el-form-item label-width="10px">
        <el-input
          v-model="form.username"
          placeholder="请输入姓名"
          @blur="nextInput()"
          @keyup.enter.native="nextInput($event)"
        ></el-input>
      </el-form-item>
      <el-form-item label-width="10px">
        <el-input
          ref="password"
          v-model="form.password"
          placeholder="请输入密码"
        ></el-input>
      </el-form-item>
   </el-form>

**js**
data(){
	form:{
		username:'',
		password:''
	}
}
methods:{
	nextInput (event) {
      if (event) {
        event.target.blur()
        this.$refs.password.focus()
      }
    },
}