Function eventsMixin

docs/themes/htx/source/js/vue.js:2356–2465

(Vue)

  }

  function eventsMixin(Vue) {
    var hookRE = /^hook:/;
    Vue.prototype.$on = function(event, fn) {
      var this$1 = this;

      var vm = this;
      if (Array.isArray(event)) {
        for (var i = 0, l = event.length; i < l; i++) {
          this$1.$on(event[i], fn);
        }
      } else {
        (vm._events[event] || (vm._events[event] = [])).push(fn);
        // optimize hook:event cost by using a boolean flag marked at registration
        // instead of a hash lookup
        if (hookRE.test(event)) {
          vm._hasHookEvent = true;
        }
      }
      return vm;
    };

    Vue.prototype.$once = function(event, fn) {
      var vm = this;
      function on() {
        vm.$off(event, on);
        fn.apply(vm, arguments);
      }
      on.fn = fn;
      vm.$on(event, on);
      return vm;
    };

    Vue.prototype.$off = function(event, fn) {
      var this$1 = this;

      var vm = this;
      // all
      if (!arguments.length) {
        vm._events = Object.create(null);
        return vm;
      }
      // array of events
      if (Array.isArray(event)) {
        for (var i = 0, l = event.length; i < l; i++) {
          this$1.$off(event[i], fn);
        }
        return vm;
      }
      // specific event
      var cbs = vm._events[event];
      if (!cbs) {
        return vm;
      }
      if (!fn) {
        vm._events[event] = null;
        return vm;
      }
      if (fn) {