021——VUE中变异方法 push/unshift pop/shift

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>变异方法:push/unshift pop/shift</title>
    <script src="vue.js"></script>
</head>
<body>
<div id="hdcms">
    <li v-for="v in comments">
        {{v.content}}
    </li>
    <textarea v-model="current_content" cols="30" rows="10"></textarea><br>
    <button v-on:click="push('end')">发表到最后</button>
    <button v-on:click="push('prev')">发表到前面</button>
    <br>
    <button v-on:click="del('pop')">删除最后一条</button>
    <button v-on:click="del('shift')">删除第一条</button>
</div>
<script>
    var app = new Vue({
        el: '#hdcms',
        data: {
            //当前用户输入内容:
            current_content: "",
            comments: [
                {content: "后盾人"},
                {content: "老师"}
            ]
        },
        methods: {
            push(type) {
                var content = {content: this.current_content};
                switch (type) {
                    case 'end':
                        this.comments.push(content);
                        break;
                    case 'prev':
                        this.comments.unshift(content);
                        break;
                }
                this.current_content = "";
            },
            del(type) {
                switch (type) {
                    case 'pop':
                        this.comments.pop();
                        break;
                    case 'shift':
                        this.comments.shift();
                        break;
                }
            }
        }
    });
</script>

</body>
</html>

  

posted @ 2017-12-25 07:28  生如逆旅,一苇以航  阅读(3181)  评论(0编辑  收藏  举报