20.VUE学习之-变异方法push的留言版实例讲解

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <!--<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>-->
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
<div id="hdcms">
    <li v-for="v in comments">
        {{v.content}}
    </li>

    <!--当textarea里的内容改变时,会动态改变data/current_content-->
    <textarea v-model="current_content" cols="30" rows="10"></textarea><br>
    <button v-on:click="push">发表</button>
</div>
<script>
    var app = new Vue({
        el: '#hdcms',
        data: {
            //当前用户输入内容
            current_content:'',
            comments: [
                {content: '测试一'},
                {content: '测试二'},
            ]
        },
        methods:{
            push(){
                //用data/current_content里动态改变的值,声明一条记录赋值给变量content
                var content = {content:this.current_content}
                //动态把content加入data/comments的数组里,动态的加入页面li列表里
                this.comments.push(content);
                //操作完后,把data/current_content里的值清空
                this.current_content ='';
            }
        }
    });
</script>
</body>
</html>