Intoduciton: The way of using '' in html part confused me when I was learning Class&Style Bindings in Vue's official guide.(of course it's also because of my weak foundation). To help newcomer understand, Vue's official guide seemed a little lengthy. So I decided to reorganize them.

The follow content won't contain many examples, you can click the superlink above to see the official guide's.

Binding Inline Styles

In my opinion, key is a pointer, which means we could save the content in somewhere and use them flexibly. In some sense, class is a pointer of style. So I'd like to introduce style firstly.

Basic syntax

• Direct：e.g.:style="{ style-name-color: data-key, style-name-fontSize: data-key + 'px' }"

  Don't forget to add uint like 'px'

• Object：:style="data-key-styleObject"

  data: {    data-key-styleObject: {      color: 'red',      fontSize: '13px'    }  }

• Array：:style="[styleObjects, overridingStyleObjects]"

  styleObjects means we could multiple "{}" and "data-key"

Advanced

• Multiple Values：:style="{ display: ['-webkit-box', '-ms-flexbox', 'flex'] }"

  This will only render the last value in the array which the browser supports. In this example, it will render display: flex for browsers that support the unprefixed version of flexbox.(Copy from Vue official guide)

Binding HTML Classes

As I said before, class is pointer of style. The diffrence is that class is found in \<style> while data-key is found in \<script>.

Basic syntax

• Direct： :class="data-key" but :class=" 'class-name' "
• Array： :class="[ data-key ]" but :class="[ 'class-name' ]"

• Object： :class="{ class-name : data-key }" & :class="{ 'class-name' : data-key }"

  In Object, if the class-name contains '-', it should be 'class-name', otherwise there will be a error.

  In Object, if use data-key with '' will turn into string => 'string', therefore it would always be true.

Advanced

• Multiple conditional classes: :class="[{ class-name: data-key }, class-name]"