Vue获取input值的四种常用方法

//使用v-model创建双向数据绑定, 用来监听用户的输入事件以更新数据，并对一些极端场景进行一些特殊处理	
<template>
    <div>
	    <input class="login-input" type="text"  v-model="username" placeholder="请输入账号">
	    <input class="login-input" type="password" v-model="password" placeholder="请输入密码">
		<div class="login-button" @click="login" type="submit">登陆</div>
	</div>
</template>
<script>
    export default {
       name: 'Login',
       data() {
            return {
                username: '',
                password: ''
            }
        },
        methods: {
            login() {
                   console.log(this.username)
                   console.log(this.password)
            }
        }
    }
<script/>
 

//输入框只要输入的值变化了就会触发 input 调用 search	
<template>
	<div class="class">
		<div>
			<input type="text" @input="search"/>
		</div>
	</div>
</template>
<script>
	export default {
		name: "Search",
		data() {
		},
		methods: {
			search(event){
				console.log( event.currentTarget.value )
			}
		}
	}
</script>

//输入框失去焦点时，输入的值发生了变化，就会触发 change 事件
<template>
	<div class="class">
		<div>
			<input type="text" @change="search"/>
		</div>
	</div>
</template>
<script>
	export default {
		name: "Search",
		data() {
		},
		methods: {
			search(event){
				console.log( event.target.value )
			}
		}
	}
</script>

//这种方式类似于原生DOM,但是ref获取数据更方便
<template>
	<div class="class">
		<input type="text" ref="inputDom" />
		<button @click="subbmitButton">获取表单数据</button>
	</div>
</template>
<script>
    export default {
		name: "Page",
		data() {
		},
		methods: {
			subbmitButton(){
				console.log( this.$refs.inputDom.value )
			}
		}
	}
</script>

<template>
  <input type="text" v-model="inputValue" />
  <button @click="checkInput">检查输入框是否有值</button>
</template>
<script>
export default {
  data() {
    return {
      inputValue: ''
    }
  },
  methods: {
    checkInput() {
      if (this.inputValue) {
        console.log('输入框有值')
      } else {
        console.log('输入框为空')
      }
    }
  }
}
</script>

<template>
  <input type="text" ref="myInput" />
  <button @click="checkInput">检查输入框是否有值</button>
</template>
<script>
export default {
  methods: {
    checkInput() {
      if (this.$refs.myInput.value) {
        console.log('输入框有值')
      } else {
        console.log('输入框为空')
      }
    }
  }
}
</script>