methods (要有一定的觸發條件才能執行，如點擊事件)
<template> <div class="safetyInfo"> <input type="text" name="" id="" placeholder="搜索" v-model="search"/> <button @click="btn">搜索</button> <ul v-for="list in searchData"> <li> <span>{{list.name}}</span> <span>{{list.date}}</span> <span>{{list.depart}}</span> </li> </ul> </div> </template> <script> export default { name: 'HelloWorld', data () { return { search:'', searchData: '', products:[ //假數據 {name:"數據1",date:'2018-01-04',depart:'瀘化工1'}, {name:"數據2",date:'2018-01-25',depart:'瀘化工2'}, {name:"數據3",date:'2018-02-10',depart:'瀘化工3'}, {name:"數據4",date:'2018-03-04',depart:'瀘化工4'}, {name:"數據5",date:'2018-05-24',depart:'瀘化工5'}, {name:"數據6",date:'2018-10-29',depart:'瀘化工6'} ] } }, methods:{ btn:function(){ var search = this.search; if (search) { this.searchData = this.products.filter(function(product) { console.log(product) return Object.keys(product).some(function(key) { console.log(key) return String(product[key]).toLowerCase().indexOf(search) > -1 }) }) } } } } </script>
computed (在HTML DOM加載后馬上執行的，如賦值):
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <script src="https://unpkg.com/vue/dist/vue.js"></script> </head> <body> <div id="app"> <input v-model='search' /> <ul v-for="item in searchData "> <li>{{item.name}},價格:￥{{item.price}}</li> </ul> </div> <script> var vm = new Vue({ el: '#app', data: { search: '', products: [{ name: '蘋果', price: 25, category: "水果" }, { name: '香蕉', price: 15, category: "水果" }, { name: '雪梨', price: 65, category: "水果" }, { name: '寶馬', price: 2500, category: "汽車" }, { name: '奔馳', price: 10025, category: "汽車" }, { name: '柑橘', price: 15, category: "水果" }, { name: '奧迪', price: 25, category: "汽車" }] }, computed: { searchData: function() { var search = this.search; if (search) { return this.products.filter(function(product) { return Object.keys(product).some(function(key) { return String(product[key]).toLowerCase().indexOf(search) > -1 }) }) } return this.products; } } }) </script> </body> </html>
注：some()為數組中的每個元素執行一次callback函數，直到它找到一個返回值為可以轉化為布爾值true的值,此時some()方法將立刻返回true，否則立刻返回false
by the way:
watch 它用於觀察Vue實例上的數據變動。對應一個對象，鍵是觀察表達式，值是對應回調。值也可以是方法名，或者是對象，包含選項。
所以他們的執行順序為：默認加載的時候先computed再watch，不執行methods；等觸發某一事件后，則是：先methods再watch
轉載：原文鏈接 https://blog.csdn.net/grylf/article/details/82737335