What does the dollar symbol mean in vue

The dollar symbol in vue is a special mark with no special meaning. Its main function is to enhance the distinction; it can distinguish the built-in instance method properties and user-defined properties, and avoid declaring or adding custom properties. cover.

The operating environment of this article: Windows 10 system, Vue version 2.9.6, DELL G3 computer.

What does the dollar symbol mean in vue

Vue instances also expose some useful instance properties and methods. They are prefixed with $ to distinguish them from user-defined properties.

is just a special mark. To enhance the distinction, to indicate that this is a built-in instance method attribute.

Avoid declaring or adding custom attributes ourselves that will cause overwriting

For example:

var data = { a: 1 }
var vm = new Vue({
  el: '#example',
  data: data
})
vm.$data === data // => true
vm.$el === document.getElementById('example') // => true
// $watch 是一个实例方法
vm.$watch('a', function (newValue, oldValue) {
  // 这个回调将在 `vm.a` 改变后调用
})

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