使用vue框架的时候，如果页面提示如下错误，则说明new Vue的时候没有传入 el 的值：
[Vue warn]: Cannot find element: #main
我们传入el 既可以，如：
var main = new Vue({
el: '#main', data: { currentActivity: 'home' } })：
[Vue warn]: Cannot find element: #main
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