vue function calls methods in methods of writing function

 1 export default {
 2   data() {
 3     return {
 4       hello:"你好"
 5     }
 6   },
 7   methods:{
 8     open(that) {
 9       that.hello = "hello world!"
10     },
11     close() {
12       this.$options.methods.open(this)
13     }
14   }
15 }

close function calls the open function, the this open function parameters in the close function is assigned to that call, so that by calling to the hello data.