Function genClassFromData

static/vuejs/vue.runtime.common.js:4241–4249

(data)

}

function genClassFromData (data) {
  var dynamicClass = data.class;
  var staticClass = data.staticClass;
  if (staticClass || dynamicClass) {
    return concat(staticClass, stringifyClass(dynamicClass))
  }
  /* istanbul ignore next */
  return ''
}

function concat (a, b) {
  return a ? b ? (a + ' ' + b) : a : (b || '')