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61 lines
1.5 KiB
61 lines
1.5 KiB
<!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> |