Two ways of writing data and el
1. There are two ways of writing el
(1). Configure the el attribute when new Vue.
(2). Create a Vue instance first, and then specify the value of el through vm.$mount('#root') .
2. There are two ways of writing data
(1). Object style
(2). How to choose the function style
: any way of writing is acceptable at present. When learning components in the future, data must use the function style, otherwise an error will be reported.
3. An important principle:
For functions managed by Vue, you must not write arrow functions. Once you write arrow functions, this is no longer a Vue instance .
Applications:
