1、需要的属性不存在，需要通过已有的属性来计算得到
2、原理是借助了object.defineproperty方法提供的getter和setter
3、get函数什么时候执行：
（1）首次读取时候执行1次
（2）当以来的数据发生改变的时候，会再次被调用
4、与methods实现相比，内部有缓存机制，效率更高，调试更方便
5、备注：
（1）计算属性后最终会出现在vm上，允许直接读取
（2）如果计算属性要被修改，必须写set函数来响应修改，并且set函数中要引起计算式以来的数据发生
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>demo1.html</title>
<link rel="stylesheet" href="static/css/bootstrap.css">
<!-- 导入vue文件 -->
<script src="static/js/vue.js"></script>
<script src="static/js/vue-router.js"></script>
</head>
<body class="container">
<div id="app">
<!--
1、需要的属性不存在，需要通过已有的属性来计算得到
2、原理是借助了object.defineproperty方法提供的getter和setter
3、get函数什么时候执行：
（1）首次读取时候执行1次
（2）当以来的数据发生改变的时候，会再次被调用
4、好处：与methods实现相比，内部有缓存机制，效率更高，调试更方便
5、备注：
（1）计算属性后最终会出现在vm上，允许直接读取
（2）如果计算属性要被修改，必须写set函数来响应修改，并且set函数中要引起计算式以来的数据发生
-->
<p><a class="btn btn-block btn-primary" href="./demo1.html">计算属性示例</a></p>
<pre v-html="getFullName()"></pre>
<div class="form-group">
<label>username</label>
<input type="text" class="form-control" v-model="Username">
</div>
<div class="form-group">
<label>say</label>
<input type="text" class="form-control" v-model="Say">
</div>
<pre v-text="UserSay"></pre>
</div>
<script>
Vue.config.productionTip = false
const vm = new Vue({
el: "#app",
data: {
Username: "Goer",
Say: "php是世界上最好的语言",
},
methods: {
getFullName: function (e) {
return "张无忌"
}
},
computed: {
UserSay: {
get() {
console.log("get被调用了！")
return this.Username + " 说： " + this.Say
},
set(value) {
console.log("set被调用了，值是:", value)
}
}
}
})
</script>
</body>
</html> 
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Please note that some features of the Service may be provided under additional and separate legal agreements
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PMID 21906588 Free PMC article
Spironolactone is a potassium and magnesium sparing diuretic that antagonizes the effects of aldosterone by binding to mineralocorticoid receptors in the distal collecting duct There are numerous handicapping angles in horse racing, all of which can lead to profits when identified and applied at the right time
HFD fed mice showed higher insulin levels than chow fed mice as expected, but there were no differences observed between treatment groups under HFD conditions Fig
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Consulting or Advisory Role Bayer, Janssen Oncology, Amgen, Pfizer, Eli Lilly, Novartis, Astellas Pharma
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