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HomeWeb 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!

Detailed explanation of Mustache interpolation syntax and v-bind instruction in Vue

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 ? &#39;active&#39;:&#39;&#39;" @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>

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