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56 lines
1.3 KiB
56 lines
1.3 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>3.天气案例_深度监视</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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<hr/> |
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<h3>a的值是:{{number.a}}</h3> |
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<button @click="number.a++">点我a+1</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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number: { |
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a: 1, |
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b: 1, |
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} |
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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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isHot: { |
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immediate: 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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'number': { |
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deep: true, // 深度监视开关 |
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handler() { |
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console.log('number被改变！ ', this.number.a) |
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} |
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} |
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} |
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}) |
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</script> |
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</body> |
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</html> |