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61 lines
1.5 KiB
61 lines
1.5 KiB
3 years ago
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>4.天气案例_监视简写</title>
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<script type="text/javascript" src="../vue.js"></script>
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</head>
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<body>
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<div id="root">
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<h3>今天天气很{{showInfo}}</h3>
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<button @click="changeWeather">切换天气</button>
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</div>
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<script>
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Vue.config.productionTip = false
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const vm = new Vue({
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el: "#root",
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data: {
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'isHot': true,
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},
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computed: {
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showInfo() {
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return this.isHot ? '炎热' : '凉爽'
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}
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},
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methods: {
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changeWeather() {
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this.isHot = !this.isHot
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}
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},
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watch: {
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// // 完整写法
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// isHot: {
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// immediate: true,
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// deep: true,
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// handler(newValue, oldValue) {
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// console.log('isHot 被修改', newValue, oldValue)
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// }
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// } ,
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// // 简写写法
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// isHot(newValue, oldValue) {
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// console.log('isHot 被修改', newValue, oldValue)
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// }
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}
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})
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// 外置完整写法
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// vm.$watch('isHot', {
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// immediate: true,
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// deep: true,
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// handler(newValue, oldValue) {
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// console.log('isHot 被修改', newValue, oldValue)
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// }
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// })
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// 外置简写写法
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vm.$watch('isHot', function(newValue, oldValue){
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console.log('isHot 被修改', newValue, oldValue)
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})
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</script>
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</body>
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</html>
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