vue.js指令v-model使用方法

vue.js的一大功能便是实现数据的双向绑定，本文就表单处理时运用v-model指令实现双向绑定做一个介绍：

v-model这个指令只能用在,这些表单元素上，所谓双向绑定，指的就是我们在js中的vue实例中的data与其渲染的dom元素上的<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>保持一致，两者无论谁被改变，另一方也会相应的更新为相同的数据。这是通过设置<a href="https://www.jb51.cc/tag/shuxing/" target="_blank" class="keywords">属性</a>访问器实现的。例如：</p> <div class="jb51code"> <pre class="brush:js;"> var data = { name: "erik",getName: function() { return this.name; },setName: function(name) { this.name = name; } }; </pre> </div> <p>上面的<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>中我们通过getName()和setName()<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>作为访问器，我们可以进一步严格限制（如借助Object.defineProperty<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>）不直接访问name这个<a href="https://www.jb51.cc/tag/shuxing/" target="_blank" class="keywords">属性</a>，所有对data.name的读写都必须通过data.getName()和data.setName()<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>。此时我们改写访问器<a href="https://www.jb51.cc/tag/fangfa/" target="_blank" class="keywords">方法</a>，<a href="https://www.jb51.cc/tag/tianjia/" target="_blank" class="keywords">添加</a>对<a href="https://www.jb51.cc/tag/shuxing/" target="_blank" class="keywords">属性</a>值改变得到监控，便可以实现数据的双向绑定。</p> <p>那么在表单处理中我们具体如何使用v-model呢，先看看官方文档给出的例子：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <form id="demo">  <p> <input type="text" v-model="msg"> {{msg}} </p>  <p> <input type="check<a href="https://www.jb51.cc/tag/Box/" target="_blank" class="keywords">Box</a>" v-model="checked"> {{checked ? "yes" : "no"}} </p>  <p> <input type="ra<a href="https://www.jb51.cc/tag/dio/" target="_blank" class="keywords">dio</a>" name="picked" value="one" v-model="picked"> <input type="ra<a href="https://www.jb51.cc/tag/dio/" target="_blank" class="keywords">dio</a>" name="picked" value="two" v-model="picked"> {{picked}} </p>  <p> <select v-model="selected"> <option>one</option> <option>two</option> </select> {{selected}} </p>  <p> <select v-model="multiSelect" multiple> <option>one</option> <option>two</option> <option>three</option> </select> {{multiSelect}} </p> <p><pre>data: {{$data | json 2}}</pre></p> </form> </pre> </div> <p>对应的js：</p> <div class="jb51code"> <pre class="brush:js;"> new Vue({ el: '#demo',data: { msg : 'hi!',checked : true,picked : 'one',selected : 'two',multiSelect: ['one','three'] } }) </pre> </div> <p><a href="https://www.jb51.cc/tag/xiaoguo/" target="_blank" class="keywords">效果</a>如下：</p> <p style="text-align: center"><p class="pic_center"><img id="theimg" src="https://files.jb51.cc/file_images/article/201703/2017320101932293.png?2017220101942" alt="" /></p></p> <p>小伙伴们可以尝试一下写出这个<a href="https://www.jb51.cc/tag/yemian/" target="_blank" class="keywords">页面</a>，在浏览器中当你调整上面表单元素的选中值时，你会发现下面打印的vue实例<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>也会随之改变，而如果你在<a href="https://www.jb51.cc/tag/daima/" target="_blank" class="keywords">代码</a>中改变vue实例data<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>时渲染出来的表单选中值也会随之改变。</p> <p>另外，v-model这个指令还有几个可选的参数：lazy,number,options,debounce</p> <p>1.使用lazy参数是将双向数据同步的时间节点从input触发改为了change触发，<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a>方式如下：</p> <div class="jb51code"> <pre class="brush:xhtml;">  <input v-model="msg" lazy> </pre> </div> <p>2.使用number参数是<a href="https://www.jb51.cc/tag/tongzhi/" target="_blank" class="keywords">通知</a>v-model绑定的dom元素把<a href="https://www.jb51.cc/tag/yonghu/" target="_blank" class="keywords">用户</a>输入值默认当成数字来处理，<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a>如下：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input v-model="age" number> </pre> </div> <p>3.使用options参数是用于渲染一个select项的列表，<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a>方式如下：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <select v-model="selected" options="myOptions"></select> </pre> </div> <p>其中options的参数名指向一个数组，该数组可以<a href="https://www.jb51.cc/tag/baokuo/" target="_blank" class="keywords">包括</a>字符串或对象，对象可以是{text:'',value:''}的形式，指定了<option>的value<a href="https://www.jb51.cc/tag/shuxing/" target="_blank" class="keywords">属性</a>与text<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>，例如：</p> <div class="jb51code"> <pre class="brush:xhtml;"> [ { text: 'A',value: 'a' },{ text: 'B',value: 'b' } ]</pre> </div> <p>将渲染出：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <select> <option value="a">A</option> <option value="b">B</option> </select> </pre> </div> <p>如果对象是{ label:'',options:[...] }的形式，则可以渲染出多个option组<optgroup>,如下例：</p> <div class="jb51code"> <pre class="brush:xhtml;"> [ { label: 'A',options: ['a','b']},{ label: 'B',options: ['c','d']} ] </pre> </div> <p>将渲染出：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <select> <optgroup label="A"> <option value="a">a</option> <option value="b">b</option> </optgroup> <optgroup label="B"> <option value="c">c</option> <option value="d">d</option> </optgroup> </select> </pre> </div> <p>4.使用debounce参数是指定一个延迟时间，延迟从按键触发到数据更新同步之间的时间，当我们的更新操作比较耗时时这个<a href="https://www.jb51.cc/tag/shuxing/" target="_blank" class="keywords">属性</a>十分有用，例如<a href="https://www.jb51.cc/tag/sousuo/" target="_blank" class="keywords">搜索</a>引擎在我们键入字符时发送ajax请求完成<a href="https://www.jb51.cc/tag/zidong/" target="_blank" class="keywords">自动</a>补全<a href="https://www.jb51.cc/tag/tishi/" target="_blank" class="keywords">提示</a>，<a href="https://www.jb51.cc/tag/diaoyong/" target="_blank" class="keywords">调用</a>如下：</p> <div class="jb51code"> <pre class="brush:xhtml;"> <input v-model="msg" debounce="500"></pre> </div> <p>以上就是本文的全部<a href="https://www.jb51.cc/tag/neirong/" target="_blank" class="keywords">内容</a>，希望对大家的学习有所帮助，也希望大家多多<a href="https://www.jb51.cc/tag/zhichi/" target="_blank" class="keywords">支持</a>编程之家。</p><i class="glyphicon glyphicon-link"></i> 原文链接：https://www.f2er.com/vue/40595.html</div> <div class="topcard-tags"><a href="https://www.f2er.com/tag/vmodel/" class="tag_link" target="_blank">v-model</a><a href="https://www.f2er.com/tag/vuejs/" class="tag_link" target="_blank">vue.js</a><a href="https://www.f2er.com/tag/zhiling/" class="tag_link" target="_blank">指令</a><a href="https://www.f2er.com/tag/zhilingp/" class="tag_link" target="_blank">指令</a></div> <ul class="list-group"> <li class="list-group-item"><a href="https://www.f2er.com/vue/40598.html" 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