Vue binding class in style with style

class lists and inline style operating element is a common demand for data binding. Because they are property, so they can be processed with v-bind. However, string concatenation cumbersome and error-prone, and therefore, when the v-bind for handling class and style, Vue do a special enhancements, in addition to the type of expression is the result of a string, it can also be objects or arrays.

Solution occurs vue double braces {} in {} of:

<style>
   [v-cloak] {
       display: none;
   }
</style>
<div v-cloak>{{message}}</div> 

class:

Object syntax:

It can be passed to v-bind: class object.

<div v-bind:class="{ active: isActive }"></div>

active presence or absence of this class will depend on the data attribute isActive is true or false.

In more properties may be passed dynamically switching a plurality of object class. In addition, v-bind: class commands may coexist with conventional class attribute.

<div
  class="static"
  v-bind:class="{ active: isActive, 'text-danger': hasError }"
></div>

data: {
  isActive: true,
  hasError: false
}

//渲染为：
<div class="static active"></div>

Binding data objects need not defined inline in a template:

<div v-bind:class="classObject"></div>

data: {
  classObject: {
    active: true,
    'text-danger': false
  }
}

The returned object can also bind a calculated property:

<div v-bind:class="classObject"></div>
data: {
  isActive: true,
  error: null
},
computed: {
  classObject: function () {
    return {
      active: this.isActive && !this.error,
      'text-danger': this.error && this.error.type === 'fatal'
    }
  }
}

Array syntax:

You can pass to an array of v-bind: class, to apply a class list.

<div v-bind:class="[activeClass, errorClass]"></div>

data: {
  activeClass: 'active',
  errorClass: 'text-danger'
}

//渲染为：
<div class="active text-danger"></div>

You can also use object syntax in the array syntax:

<div v-bind:class="[{ active: isActive }, errorClass]"></div>

Used in the assembly:

When the class attribute in a custom component that class will be added to the root element of the assembly above.

If the same type is present, on a custom category class overrides the components on the root element of the assembly.

Vue.component('my-component', {
  template: '<p class="foo bar">Hi</p>'
})
<my-component class="baz boo"></my-component>

//渲染为：
<p class="foo bar baz boo">Hi</p>

style：

When the v-bind: When you need to add style to use browser engine prefix CSS properties, such as transform, Vue.js will automatically detect and add the appropriate prefix.

Object syntax:

v-bind: object syntax style is very intuitive, is a JavaScript object. CSS property name can be separated by dashes or camel (in quotes) is named:

<div v-bind:style="{ color: activeColor, fontSize: fontSize + 'px' }"></div>

data: {
  activeColor: 'red',
  fontSize: 30
}

Direct binding template will more clearly on a style object:

<div v-bind:style="styleObject"></div>
data: {
  styleObject: {
    color: 'red',
    fontSize: '13px'
  }
}

Object Syntax often combined use calculated properties of the returned object.

Array syntax:

v-bind: array syntax style may be applied to a plurality of the same style object element:

<div v-bind:style="[baseStyles, overridingStyles]"></div>

Multiple values:

From 2.3.0 onwards can provide style binding properties of an array with multiple values, used to provide more value prefixed, write only the last value in the array to render a supported browser.

<div :style="{ display: ['-webkit-box', '-ms-flexbox', 'flex'] }"></div>