Vue.createApp不工作，但正在使用新的Vue()方法
我收到此错误tesyya.js:16 Uncaught TypeError: Vue.createApp is not a function
mycode如下所示：
const app = Vue.createApp({
data() {
return {
count: 4
}
}
})
const vm = app.mount('#app')
console.log(vm.count)<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>My GK</title>
</head>
<body>
<div class="app">
<h1>this might be challenging for you</h1>
<ul id="addhere">
<li v-for="goal in goals">{{goal}}</li>
</ul>
<input type="text" name="text" id="addthis" v-model="enteredval" />
<input type="button" value="ADD" id="add" v-on:click="add()" />
</div>
<script src="https://unpkg.com/vue"></script>
<script src="tesyya.js"></script>
</body>
</html>请允许我弄错，我是初学者
解决方案
createApp方法适用于VUE 3，错误指示您正在使用VUE 2。以下是具有正确语法的适用于VUE 2和VUE 3的等效示例应用程序。
版本2：
CDN：<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.14/vue.min.js"></script>
new Vue({
el: "#app",
data() {
return {
someValue: 10
}
},
computed: {
someComputed() {
return this.someValue * 10;
}
}
});<div id="app">
Some value: {{ someValue }} <br />
Some computed value: {{ someComputed }}
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.14/vue.min.js"></script>版本3：
CDN：<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/3.2.30/vue.global.min.js"></script>
const { createApp, ref, computed } = Vue;
const app = createApp({
setup() {
const someValue = ref(10);
const someComputed = computed(() => someValue.value * 10);
return {
someValue,
someComputed
}
}
});
app.mount("#app");<div id="app">
Some value: {{ someValue }} <br />
Some computed value: {{ someComputed }}
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/3.2.30/vue.global.min.js"></script>