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### 一、Vue3.x中的双休数据绑定实现人员登记系统 ![](https://img.kancloud.cn/b2/f2/b2f2c5266a00553dfb623eada151bfac_268x376.png) ### 二、Vue3.x Dom操作 **1、第一种方法 原生js** ~~~ <template> <h2>人员登记系统</h2> <div class="people_list"> <ul> <li>姓名: <input type="text" id="username" /></li> </ul> <button @click="doSubmit()" class="submit">获取表单的内容</button> </div> </template> ~~~ ~~~ <script> export default { data() { return { message: "你好", }; }, methods: { doSubmit() { var username = document.querySelector("#username"); alert(username.value); }, }, }; </script> ~~~ **2、第二种方法 ref获取dom节点** ~~~ <template> <h2>人员登记系统</h2> <div class="people_list"> <ul> <li>姓名: <input type="text" id="username" /></li> <li>年龄: <input type="text" ref="age" /></li> </ul> <button @click="doSubmit()" class="submit">获取表单的内容</button> </div> </template> ~~~ ~~~ export default { data() { return { message: "你好", }; }, methods: { doSubmit() { var username = document.querySelector("#username"); alert(username.value); var ageDom = this.$refs.age; alert(ageDom.value); }, }, }; ~~~ ### 三、Vue3.x双休数据绑定 MVVM就是我们常说的双向数据绑定,vue就是一个MVVM的框架。 M 表示`model`, V `view` 在MVVM的框架中 model改变会影响视图view,view视图改变反过来影响model。 \*\*注意:\*\*双休数据绑定主要用于表单中。 ~~~ <template> <h2>人员登记系统</h2> <div class="people_list"> <ul> <li>姓名: <input type="text" v-model="peopleInfo.username" /></li> <li>年龄: <input type="text" v-model="peopleInfo.age" /></li> </ul> <button @click="doSubmit()" class="submit">获取表单的内容</button> </div> </template> ~~~ ~~~ export default { data() { return { peopleInfo: { username: "", age: "", }, }; }, methods: { doSubmit() { console.log(this.peopleInfo); }, }, }; ~~~ ### 四、 input、checkbox、radio、select、 textarea中的双休数据绑定 **模板** ~~~ <template> <h2>人员登记系统</h2> <div class="people_list"> <ul> <li>姓 名: <input type="text" v-model="peopleInfo.username" /></li> <li>年 龄: <input type="text" v-model="peopleInfo.age" /></li> <li>性 别:</li> <input type="radio" value="1" id="sex1" v-model="peopleInfo.sex" /> <label for="sex1">男</label> <input type="radio" value="2" id="sex2" v-model="peopleInfo.sex" /> <label for="sex2">女</label> <li> 城 市: <select name="city" id="city" v-model="peopleInfo.city"> <option v-for="(item, index) in peopleInfo.cityList" :key="index" :value="item"> {{ item }} </option> </select> </li> <li> 爱 好: <span v-for="(item, index) in peopleInfo.hobby" :key="index"> <input type="checkbox" :id="'check' + index" v-model="item.checked" /> <label :for="'check' + key"> {{ item.title }}</label> &nbsp;&nbsp; </span> </li> <li> 备 注: <textarea name="mark" id="mark" cols="30" rows="4" v-model="peopleInfo.mark"></textarea> </li> </ul> <button @click="doSubmit()" class="submit">获取表单的内容</button> </div> </template> ~~~ **业务逻辑:** ~~~ export default { data() { return { peopleInfo: { username: "", age: "", sex: "2", cityList: ["北京", "上海", "深圳"], city: "上海", hobby: [{ title: "吃饭", checked: false, }, { title: "睡觉", checked: false, }, { title: "敲代码", checked: true, }, ], mark: "", }, }; }, methods: { doSubmit() { console.log(this.peopleInfo); }, }, }; ~~~ **css:** ~~~ ul { list-style-type: none; } h2 { text-align: center; } .people_list { width: 400px; margin: 40px auto; padding: 40px; border: 1px solid #eee; } .people_list li { height: 50px; line-height: 50px; } .form_input { width: 300px; height: 28px; } .submit { float: right; margin-top: 10px; } ~~~