Simple include directive when using vue.js

vue-include.js

Vue.directive('include', function () {
  var url = this.expression
  var _this = this
  var request = new XMLHttpRequest()
  request.open('GET', url, true)
  request.onreadystatechange = function() {
    if (this.readyState !== 4) return
    if (this.status !== 200) return
    _this.el.innerHTML = this.responseText
  }
  request.send();
})

new Vue({
  el: 'body'
})

// use example: <div v-include="foo.svg"></div>