vue混合策略简说：

var mixin = {
  methods: {
    foo: function () {
      console.log('foo')
    },
    conflicting: function () {
      console.log('from mixin')
    }
  },
  created() {
      this.conflicting()
  }
}
var vm = new Vue({
  el: '#app',
  mixins: [mixin],
  methods: {
    bar: function () {
      console.log('bar')
    },
    conflicting: function () {
      console.log('from self')
    }
  },
  created() {
      this.conflicting()
  }
})
vm.foo()
vm.bar()
vm.conflicting()

//执行结果？
//混合策略？