var vm = new Vue({ el: '#app', delimiters: ['${', '}'], data: { userName: '', errMsg: '' }, watch: { userName: function(value) { if(this._valid( ... ... <看更多>

But, I also need that function to fire for the initial value of the data property. The watcher does not fire when the component initializes ... ... <看更多>

Set initial value. Then I create watcher. Since the variable has not changed its value since the watcher was created, you expect the handler to ... ... <看更多>

It seems that watchers are not triggered when the vue instance (or component) is being created. Only subsequent changes of the prop trigger the watch ... ... <看更多>

Vue 3 Animations Tutorial #3 - Transition Component. Watch later. Share. Copy link. Info. Shopping. Tap to ... ... <看更多>