Resetting VueJS data properties to initial values
If you really need to reset all of your data properties by firing the data() method again, you can do that like so:
methods: { reset() { Object.assign(this.$data, this.$options.data.call(this)); }}The this variable in the this.$options.data is referencing the options, not the vue component instance. That's why the localvar property was undefined. So if you're calling it from the vue instance, you'll need to give it a reference to this via the function's call() method.
But, in most circumstances, I would just assign the value directly instead of calling Object.assign:
methods: { reset() { this.localvar = this.propvar; }}