How can I use ‘img src’ in Vue.js? [duplicate]

Try this:

<img v-bind:src="'/media/avatars/' + joke.avatar" /> 

Don’t forget single quote around your path string.
Also in your data, check you have a correctly defined image variable.

joke: {
  avatar: 'image.jpg'
}

A working demo is here: http://jsbin.com/pivecunode/1/edit?html,js,output