Web Front-endVue.jsDetailed explanation of Mustache interpolation syntax and v-bind instruction in Vue
This article will introduce to you the Mustache interpolation syntax and v-bind instruction in Vue. I hope it can help you!
1. Mustache interpolation syntax
⭐⭐mustache syntax: It means "beard", It is said that it is because the embedded tag looks like a beard {{}} (I don’t think it looks like O(∩_∩)O haha~)
It is the most commonly used to display data in a template. The syntax is "Mustache" syntax (double braces) text interpolation
- data The returned object is added to Vue's responsive system; (Learning video sharing: vue video tutorial)
- When the data in data changes, the corresponding content will also be updated.
- Mustache can not only be an attribute in data, but also a JavaScript expression
⭐⭐
We can write:
- Value
- Expression
- Ternary expression
- Call the function in methods
<div id="app">
<h2 id="message">{{message}}</h2>
<h2 id="当前计数-counter">当前计数：{{counter}}</h2>
<!-- 2.表达式 -->
<h2 id="计数双倍-counter">计数双倍：{{counter*2}}</h2>
<h2 id="展示的信息-info-split-nbsp">展示的信息:{{info.split(" ")}}</h2>
<!-- 3.三元表达式 -->
<h2 id="age-成年人-nbsp-nbsp-未成年人">{{age>=18?"成年人" : "未成年人"}}</h2>
<!-- 4.调用methods中函数 -->
<h2 id="formatDate-time">{{formatDate(time)}}</h2>
</div>2. v-bind Binding attributes
2.1.v-bind binding basic attributes
⭐⭐
One-way binding v-bind: data It can only flow from data to the page
We can use v-bind to bind attributes, such as dynamically binding the href attribute of the a element and the src attribute of the img element
v-bind is used to
- Bind one or more attribute values
- Pass props value to another component**(props: equivalent to the input of a component, followed by You will learn)
v-bind:href can be written as: href This is the syntactic sugar of v-bind
<div id="app">
<!-- 1.绑定img的src属性 -->
<button @click="switchImage">切换图片</button>
<img src="/static/imghwm/default1.png" data-src="showImgUrl" class="lazy" v-bind: alt="" />
<!--语法糖 v-bind: = : -->
<!-- 2.绑定a的href属性 -->
<a v-bind:href="href">百度一下</a>
</div>2.2.v-bind binding class
⭐⭐
1. Basic binding class
<h2 id="Hello-nbsp-World">Hello World</h2>
2. Dynamic class can write object syntax
<button :class="isActive ? 'active':''" @click="btnClick"> 我是按钮 </button>
3.Object syntax Basically use
<button :class="{active:isActive}" @click="btnclick">我是按钮</button>4. Multiple key-value pairs of object syntax, dynamically bound classes can be used at the same time as ordinary classes
- We can give v-bind: class is an object used to dynamically switch classes
- Of course, v-bind:class can also coexist with ordinary class attributes
<button class="abc cba" :class="getDynamicClasses" @click="btnClick"> 我是按钮 </button>
2.3.v-bind binding Define style
⭐⭐
1. Ordinary html writing method
<h2 id="hhh">hhh</h2>
2. Some values in style come from data
Dynamic binding style, followed by the object type
<h2 id="hhhh">hhhh</h2>
3. Dynamic binding attribute, this attribute is an object
<h2 id="hhhhh">hhhhh</h2>
2.4.v-bind binding attribute name
⭐⭐Bind the attribute name in data
Use when the attribute name is not fixed: [attribute name] = "value"
<h2 id="Hello-nbsp-World">Hello World</h2>Hot AI Tools
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