vue的computed属性的理解

computed: {
    selectedQuestions() {
      let selectedQuestions = this.editedItem.questions;
      return this.questions.filter(function (question) {
        return selectedQuestions.includes(question.id);
      });
    },

computed计算属性，每次进入页面将一直沿用selectedQuestions第一次的信息，不会再触发selectedQuestions，这就是依赖缓存，只有

this.editedItem.questions发生改变了selectedQuestions才会触发，值才会改变