Question

我想用Vue js中的另一个变量初始化一个变量在这里，我想用'select'变量

初始化'multiple'变量

    <div id="myapp">
     <select v-model="select">
            <option selected>A</option>
            <option>B</option>
            <option>C</option>
        </select>
        <span>Selected {{select}}</span>
        <hr>
        <select v-model="multiple" multiple>
            <option selected>A</option>
            <option>B</option>
            <option>C</option>
        </select>
        <span>Multiple Selected :{{ multiple | JSON}}</span>
    </div>

<script src="https://cdn.jsdelivr.net/vue/latest/vue.js"></script>   
<script>
    var vm=new Vue({
       el:'#myapp',
       data:{
                select:'B',
                multiple:select
        }
})
</script>`

我在这里收到如下错误： 未捕获的ReferenceError：未定义选择

Answer 1

您无法在SELECT `messages`.*, `user`.`firstname`, `user`.`lastname`, `user`.`organisation_name`, `user`.`type`, `user_info`.`profile_picture`, `user_info`.`logo`, `user`.`email` FROM (`messages`) JOIN `user` ON `user`.`user_id` = `messages`.`from_id` JOIN `user_info` ON `user_info`.`uid` = `messages`.`from_id` WHERE `messages`.`from_id` = '4' AND `messages`.`to_id` = '24572' AND `messages`.`time_sent` <= '2016-06-23 12:41:47' OR `messages`.`from_id` = '24572' AND `messages`.`to_id` = '4' AND `messages`.`time_sent` <= '2016-06-23 12:41:47' ORDER BY `messages`.`msg_id` DESC方法中访问此类数据属性。

如果你想这样做（虽然在这个例子中似乎有点无用），你必须在外面定义一个变量，然后在data()中引用它

data()

如何从Vue.js中的另一个变量初始化一个变量

1 个答案: