javascript - vue.js assignments are all two-way binding. How to only assign values ​​but not two-way binding?

Question

The data in vue is two-way bound.
But I don’t want to bind, I just want to assign the value to vue, but the original attributes remain unchanged, that is, one-way assignment?

var v = new Vue({el: "#a",data:{ a: ''}

})

开始 a = '';
var b = 2;
v.a = b;

v.a = 3; // 这里b也等于3了

我想
v.a =3; // 但是b还是等于2

What method is used to assign values?

Answer 1

Two-way binding only works in templates

Answer 2

b will not also be equal to 3

Answer 3

Put the code on codepen and reproduce it?