SOURCE

> Uncaught ReferenceError: Vue is not defined

var demo = new Vue({
    el: '#main',
    data: {
        show_tooltip: false,
        text_content: 'Edit me.'
    },
    methods: {
        hideTooltip: function(){
            this.show_tooltip = false;
        },
        toggleTooltip: function(){
            this.show_tooltip = !this.show_tooltip;
        }
    }
});

<div id="main" v-cloak @click="hideTooltip" >
    <div class="tooltip" v-if="show_tooltip" @click.stop>
        <input type="text" v-model="text_content" />
    </div>
    <p @click.stop="toggleTooltip">{{text_content}}</p>
</div>

[v-cloak] {
  display: none;
}
*{
    margin:0;
	padding:0;
}
body{
    font-family:Microsoft YaHei;
    text-align:center;
}
li{
    list-style:none;
}
.tooltip{
	background-color:#5c9bb7;
	border-radius:3px;
	width: 290px;
	padding: 10px;
	position: absolute;
	left:50%;
	margin-left:-150px;
	top: 80px;
}
.tooltip:after{
	content:'';
	position:absolute;
	border:6px solid #5190ac;
	border-color:#5190ac transparent transparent;
	width:0;
	height:0;
	bottom:-12px;
	left:50%;
	margin-left:-6px;
}
.tooltip input{
	border: none;
	width: 100%;
	line-height: 34px;
	border-radius: 3px;
	box-shadow: 0 2px 6px #bbb inset;
	text-align: center;
	font-size: 16px;
	font-family: inherit;
	color: #8d9395;
	font-weight: bold;
	outline: none;
}
p{
	font-size:22px;
	font-weight:bold;
	color:#6d8088;
	height: 30px;
	cursor:pointer;
}
p:before{
	content:'✎';
	display:inline-block;
	margin-right:5px;
	font-weight:normal;
	vertical-align: text-bottom;
}
#main{
	height:300px;
	position:relative;
	padding-top: 150px;
}