Vue is not defined

Vue.component('todo-item',{
??template:'<li>item</li>'
});

export?default?{
??data:function(){
????return?{
?????//?title?:'<span>?</span>This?is?my?first?way',
??????items:[],
??????newItem:'',
??????childWold:'',
??????isFinished:'thisIsLiClass',
??????ishouse:'thisisLihouse',
??????firstName:'',
??????lastName:'',
??????count:0,
??????title:'this?is?hello?world',
??????content:'balabalabalaba',
??????show:true,
??????inputValue:''
????}
??},
??computed:{
????fullName:function(){
??????return?this.firstName?+?'?'?+?this.lastName
????}
??},
??watch:{
????fullName:function(){
??????this.count++;
????}
??},
??methods:{
????handleClick:function(){
??????this.title?=?'how?are?you'
????},
????handleToggle:function(){
??????this.show?=?!this.show
????},
????handleSubmit:function(){
??????this.items.push(this.inputValue);
??????this.inputValue?=?'';
????}
??}

}

NoError2018

2018-09-18

源自：vue2.5入門 2-1

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NoError2018 提問者
2018-09-18

<!DOCTYPE?html>
<html?lang="en">
<head>
????<meta?charset="UTF-8">
????<title>Title</title>
????<script?src="./vue.js"></script>
</head>
<body>
<div?id="root">
????<div>
????????<input?v-model="inputValue">
????????<button?@click="handleSubmit">提交</button>
????</div>

????<ul>
?<!--<li?v-for="(item,index)?of?items"?:key="index">{{item}}</li>-->
?<todo-item?v-for="(item,index)?of?items"?:key="index"?:content="item"></todo-item>
????</ul>
</div>

<script>
Vue.component('todo-item',{
????props:['content'],
?template:'<li>{{content}}</li>'
})
new?Vue({
????el:'#root',
?data:{
????????items:[],
?inputValue:''
?},
?methods:{
????????handleSubmit:function?()?{
????????????this.items.push(this.inputValue);
?this.inputValue?=?''
?}
????}
})
</script>
</body>
</html>