<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <meta name="viewport" content="width=device-width">
</head>
<style>

    html, body, #editor {
        margin: 0;
        height: 100%;
        font-family: 'Helvetica Neue', Arial, sans-serif;
        color: #333;
    }

    textarea, #editor div {
        display: inline-block;
        width: 49%;
        height: 100%;
        vertical-align: top;
        box-sizing: border-box;
        padding: 0 20px;
    }

    textarea {
        border: none;
        border-right: 1px solid #ccc;
        resize: none;
        outline: none;
        background-color: #f6f6f6;
        font-size: 14px;
        font-family: 'Monaco', courier, monospace;
        padding: 20px;
    }

    code {
        color: #f66;
    }
</style>
<body>


<div id="editor">
    <textarea :value="input" @input="update"></textarea>
    <div v-html="compiledMarkdown"></div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>
<script src="https://unpkg.com/marked@0.3.6"></script>
<script src="https://unpkg.com/lodash@4.16.0"></script>
<script>
    new Vue({
        el: '#editor',
        data: {
            input: '# hello'
        },
        computed: {
            compiledMarkdown: function () {
                return marked(this.input, { sanitize: true })
            }
        },
        methods: {
            update: _.debounce(function (e) {
                this.input = e.target.value
            }, 300)
        }
    })
</script>

</body>
</html>

 输入文字

# hello
## 不可思议把
* 去死吧

模版内容随之变化 

还是挺有趣的，。代码又少。。。功能又强大