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my-vue-app

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提交 e4ba69d8 编写于 作者: J Jeff Fox
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计算属性 computed

上级 4a0308c5
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runoob.com/str-reverse2.html 0 → 100644
浏览文件 @ e4ba69d8
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="app">
<p>原始字符串: {{ message }}</p>
<p>计算后反转字符串: {{ reversedMessage }}</p>
</div>
<script>
const app = {
data() {
return {
message: 'RUNOOB!!'
}
},
computed: {
// 计算属性的 getter
reversedMessage: function() {
// `this` 指向 vm 实例
return this.message.split('').reverse().join('')
}
}
}
Vue.createApp(app).mount('#app')
</script>
</body>
</html>
runoob.com/str-reverse3.html 0 → 100644
浏览文件 @ e4ba69d8
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="app">
<p>原始字符串: {{ message }}</p>
<p>使用 computed 计算后反转字符串: {{ reversedMessage }}</p>
<p>使用 methods 计算后反转字符串: {{ reversedMessage2() }}</p>
</div>
<script>
const app = {
data() {
return {
message: 'RUNOOB!!'
}
},
computed: {
// 计算属性的 getter
reversedMessage: function() {
// `this` 指向 vm 实例
return this.message.split('').reverse().join('')
}
},
methods: {
reversedMessage2: function() {
return this.message.split('').reverse().join('')
}
}
}
Vue.createApp(app).mount('#app')
</script>
</body>
</html>
runoob.com/str-reverse4.html 0 → 100644
浏览文件 @ e4ba69d8
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
<script src="https://unpkg.com/vue@next"></script>
</head>
<body>
<div id="app">
</div>
<script>
const app = {
data() {
return {
name: 'Google',
url: 'http://www.google.com'
}
},
computed: {
site: {
// getter
get: function() {
return this.name + ' ' + this.url
},
// setter
set: function(newValue) {
var names = newValue.split(' ')
this.name = names[0]
this.url = names[names.length - 1]
}
}
}
}
vm = Vue.createApp(app).mount('#app')
document.write('name: ' + vm.name);
document.write('<br>');
document.write('url: ' + vm.url);
document.write('<br>------ 更新数据 ------<br>');
// 调用 setter， vm.name 和 vm.url 也会被对应更新
vm.site = '菜鸟教程 https://www.runoob.com';
document.write('name: ' + vm.name);
document.write('<br>');
document.write('url: ' + vm.url);
</script>
</body>
</html>
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