zj-Exercise/vue/vue_test/16_src_nextTick/components/MyHeader.vue

<template>
    <div class="todo-header">
        <input type="text" @keyup.enter="add" v-model="title" placeholder="请输入你的任务名称，按回车键确认"/>
    </div>
</template>

<script>
    import {nanoid} from 'nanoid'
    export default {
        name: "MyHeader",
        data(){
            return{
                title:''
            }
        },
        methods: {
            add() {
                // 校验数据
                if(!this.title.trim()) return alert('输入不能为空')
                //console.log(e.target.value);
                //将用户的输入包装成一个todo对象
                const todoObj = {id:nanoid(),title:this.title,done:false}
                // console.log(todoObj)
                // 通知App组件去添加一个todo对象
                this.$emit('addTodo',todoObj)
                // 情况输入
                this.title = ''
            },
        },
    };
</script>

<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
    0 0 8px rgba(82, 168, 236, 0.6);
}
</style>