响应式数据是vue的一大亮点,下面我们来聊聊如何声明响应式数据
目录
直接声明变量
- 直接声明变量并不能使之拥有响应性
- 示例:
<script setup>
let num = 0;
const clickFun = () => {
console.log("num:", ++num);
}
</script>
<template>
<div style="display:flex;flex-direction: column;">
<span>num : {{num}}</span>
<button @click="clickFun()">修改</button>
</div>
</template>
- 运行结果:
- 多次点击按钮后,控制台打印的num值虽然有增加,但在html页面显示的num值却不变
ref(基本数据类型)
- 使用ref(基本数据类型)即可把一个基本数据类型的值转化为响应式并返回
- 基本数据类型:
- String
- Number
- BigInt
- Boolean
- Symbol
- Undefined
- Null
- 示例:
<script setup>
import { ref } from 'vue';
let num = 0;
let refNum = ref(0);
console.log("refNum:", refNum);
console.log("refNum.value", refNum.value);
const clickFun = () => {
console.log("num:", ++num);
console.log("refNum.value:" , ++refNum.value);
}
</script>
<template>
<div style="display:flex;flex-direction: column;">
<span>num : {{num}}</span>
<span>refNum : {{refNum}}</span>
<button @click="clickFun()">修改</button>
</div>
</template>
- 运行结果:
- 注意ref()返回的是一个refImpl的对象,它的value属性才是我们要的数据,所以在js中操作时需要.value,但在<template>中会自动展开为内部值
- 可以看到,通过ref()获取的变量是响应式的,会随着变量值的改变而体现在html页面中
reactive(对象)
- reactive()需要我们传入一个对象
- 示例:
<script setup>
import { ref,reactive } from 'vue';
let num = 0;
let refNum = ref(0);
let rea = reactive({
num:0
});
console.log("refNum:", refNum);
console.log("refNum.value", refNum.value);
console.log("rea", rea);
const clickFun = () => {
console.log("num:", ++num);
console.log("refNum.value:" , ++refNum.value);
console.log("rea.num:", ++rea.num);
}
</script>
<template>
<div style="display:flex;flex-direction: column;">
<span>num : {{num}}</span>
<span>refNum : {{refNum}}</span>
<span>rea.num : {{rea.num}}</span>
<button @click="clickFun()">修改</button>
</div>
</template>
- 运行结果:
- reactive()也可以让变量得到响应性
- 但它需要传入对象,而ref()需要传入基本数据类型
- 而且它返回的是一个proxy对象,但我们在js操作和在<template>绑定时,都可以直接访问和操作其内部变量。
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Understanding COSC Accreditation and Its Importance in Watchmaking
COSC Validation and its Rigorous Standards
Controle Officiel Suisse des Chronometres, or the Controle Officiel Suisse des Chronometres, is the authorized Switzerland testing agency that verifies the precision and precision of timepieces. COSC validation is a symbol of excellent craftsmanship and trustworthiness in chronometry. Not all timepiece brands follow COSC validation, such as Hublot, which instead sticks to its own stringent standards with mechanisms like the UNICO calibre, attaining equivalent precision.
The Art of Precision Chronometry
The central mechanism of a mechanized timepiece involves the mainspring, which delivers energy as it loosens. This system, however, can be prone to environmental elements that may impact its precision. COSC-certified movements undergo demanding testing—over 15 days in various circumstances (5 positions, three temperatures)—to ensure their resilience and reliability. The tests assess:
Mean daily rate accuracy between -4 and +6 secs.
Mean variation, peak variation rates, and impacts of thermal variations.
Why COSC Validation Is Important
For watch enthusiasts and collectors, a COSC-certified watch isn’t just a item of technology but a proof to lasting quality and accuracy. It signifies a timepiece that:
Presents excellent dependability and accuracy.
Ensures guarantee of superiority across the complete design of the watch.
Is likely to maintain its worth more effectively, making it a wise choice.
Well-known Timepiece Brands
Several well-known manufacturers prioritize COSC accreditation for their timepieces, including Rolex, Omega, Breitling, and Longines, among others. Longines, for instance, presents collections like the Record and Soul, which showcase COSC-certified mechanisms equipped with advanced substances like silicon balance springs to enhance durability and efficiency.
Historic Context and the Evolution of Timepieces
The concept of the timepiece dates back to the need for precise chronometry for navigational at sea, highlighted by John Harrison’s work in the eighteenth cent. Since the official foundation of Controle Officiel Suisse des Chronometres in 1973, the validation has become a yardstick for evaluating the accuracy of high-end watches, sustaining a tradition of excellence in watchmaking.
Conclusion
Owning a COSC-accredited timepiece is more than an aesthetic selection; it’s a commitment to quality and accuracy. For those valuing accuracy above all, the COSC accreditation provides peace of mind, ensuring that each accredited watch will perform reliably under various circumstances. Whether for individual contentment or as an investment decision, COSC-validated timepieces distinguish themselves in the world of horology, carrying on a tradition of careful timekeeping.
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Understanding COSC Validation and Its Importance in Horology
COSC Accreditation and its Strict Criteria
Controle Officiel Suisse des Chronometres, or the Controle Officiel Suisse des Chronometres, is the authorized Switzerland testing agency that certifies the precision and precision of wristwatches. COSC accreditation is a sign of quality craftsmanship and reliability in timekeeping. Not all watch brands follow COSC validation, such as Hublot, which instead adheres to its proprietary strict standards with movements like the UNICO calibre, reaching equivalent accuracy.
The Art of Exact Timekeeping
The core system of a mechanized watch involves the mainspring, which delivers energy as it loosens. This system, however, can be vulnerable to external factors that may affect its precision. COSC-certified mechanisms undergo rigorous testing—over 15 days in various circumstances (5 positions, three temperatures)—to ensure their durability and dependability. The tests assess:
Average daily rate accuracy between -4 and +6 secs.
Mean variation, highest variation rates, and effects of temperature changes.
Why COSC Accreditation Is Important
For timepiece enthusiasts and connoisseurs, a COSC-accredited watch isn’t just a piece of tech but a testament to lasting excellence and precision. It symbolizes a watch that:
Provides exceptional dependability and precision.
Offers guarantee of superiority across the whole design of the timepiece.
Is probable to hold its value more efficiently, making it a wise choice.
Well-known Chronometer Brands
Several famous manufacturers prioritize COSC certification for their watches, including Rolex, Omega, Breitling, and Longines, among others. Longines, for instance, provides collections like the Archive and Soul, which highlight COSC-validated movements equipped with innovative substances like silicon balance suspensions to boost resilience and performance.
Historical Background and the Evolution of Timepieces
The concept of the chronometer dates back to the need for exact chronometry for navigation at sea, emphasized by John Harrison’s work in the eighteenth century. Since the formal foundation of Controle Officiel Suisse des Chronometres in 1973, the validation has become a standard for assessing the accuracy of high-end timepieces, continuing a tradition of excellence in horology.
Conclusion
Owning a COSC-validated watch is more than an aesthetic selection; it’s a commitment to excellence and accuracy. For those appreciating precision above all, the COSC accreditation provides peace of thoughts, ensuring that each certified timepiece will function reliably under various conditions. Whether for individual contentment or as an investment decision, COSC-accredited timepieces stand out in the world of watchmaking, maintaining on a legacy of meticulous timekeeping.
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