Vue 3 - watch multiple values 28th Jun, 2022 Recently I had a situation in Vue that involved watching multiple values and then acting based on their changes.Here's how you can do it:watch( () => [form.available_
在这个示例中,我们创建了一个 Vue 实例,它有两个数据属性 a 和b,它们被封装在一个名为 values 的对象中。我们使用了深度监听(deep: true)来观察 values 对象内部属性的变化,并在控制台中打印出变化前后的值。 希望这个回答能帮助你理解如何在 Vue 中同时监听多个值的变化!
The function receives the new and old values of the data property as arguments. watch(propertyName, handler)。 Example. Here is an example of how to use the watch API: import { ref, watch } from 'vue'。 const count = ref(0)。 watch(count, (newValue, oldValue) => {。 console....
A watcher can also watch multiple sources at the same time using an array:const firstName = ref('') const lastName = ref('') watch([firstName, lastName], (newValues, prevValues) => { console.log(newValues, prevValues) }) firstName.value = 'John' // logs: ["John", ""] [""...
{unit:'px',// Default unit for numeric valueswatchDirs:['./src/**/*.{wxml,js,vue,jsx,tsx,html}'],// Files to watchoutputDir:'./dist/css',// Output directory for generated CSSoutputFileName:'generated.css',// Output CSS file namebatchBaseDelay:500,// Base delay for batch process...
import { watch, ref } from "@vue/composition-api"; const stringRef = ref(""); const numberRef = ref(1); const booleanRef = ref(false); watch([stringRef, numberRef, booleanRef], ([str, num, bool]) => { // str is string | number | boolean; expected string // num is string...
2, 3, 4] Now you update the array by pushing some more values into it: array.push(5); array.push(6); array.push(7);// array = [1, 2, 3, 4, 5, 6, 7] Here's the question: hasarraychanged? Well, it's not that simple. ...
Vue是一种非常流行JavaScript前端框架,正在经历巨大的增长。 It is simple, tiny (~24KB), and very performant. It feels different from all the other JavaScript front-end frameworks and view libraries. Let’s find out why. 它简单,小巧(〜24KB),并且性能很高。 感觉与所有其他JavaScript前端框架和视图...
For both'pre'and'post', the callback is buffered using a queue.The callback will only be added to the queue once, even if the watched value changes multiple times.The interim values will be skipped and won't be passed to the callback. ...
Let's say you set up an array with some values in it: const array = [1, 2, 3, 4]; // array = [1, 2, 3, 4] 1. 2. Now you update the array by pushing some more values into it: array.push(5); array.push(6);